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4cade/src/prorwts2.a
Peter Ferrie 094cc9fddd compress DHGR, too
2020-03-12 12:36:01 -07:00

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;license:BSD-3-Clause
;extended open/read/write binary file in ProDOS filesystem, with random access
;copyright (c) Peter Ferrie 2013-2020
ver_02 = 1
!if ver_02 = 1 {
!cpu 6502
} else { ;ver_02 = 0
!cpu 65c02
} ;ver_02
;place no code before init label below.
;user-defined options
verbose_info = 0 ;set to 1 to enable display of memory usage
enable_floppy = 0 ;set to 1 to enable floppy drive support
poll_drive = 0 ;set to 1 to check if disk is in drive, recommended if allow_multi is enabled
use_smartport = 1 ;set to 1 to enable support for more than two MicroDrive (or more than four CFFA) partitions
override_adr = 1 ;set to 1 to require an explicit load address
aligned_read = 0 ;set to 1 if all reads can be a multiple of block size
enable_readseq=0 ;set to 1 to enable reading multiple sequential times from the same file without seek
;(exposes a fixed address that can be called for either floppy or hard disk support)
enable_write = 1 ;set to 1 to enable write support
;file must exist already and its size cannot be altered
;writes occur in multiples of block size
enable_format= 0 ;used only by RWTS mode, requires enable_write and fast_subindex
enable_seek = 1 ;set to 1 to enable seek support
;seeking with aligned_read=1 requires non-zero offset
allow_multi = 0 ;set to 1 to allow multiple floppies
allow_zerovol= 0 ;set to 1 to support volume 0 (=last used volume)
check_chksum = 0 ;set to 1 to enforce checksum verification for floppies
allow_subdir = 1 ;set to 1 to allow opening subdirectories to access files
might_exist = 0 ;set to 1 if file is not known to always exist already
;makes use of status to indicate success or failure
many_files = 0 ;set to 1 to support more than 256 files in a directory
allow_aux = 1 ;set to 1 to allow read/write directly to/from aux memory
;requires load_high to be set for arbitrary memory access
;else driver must be running from same memory target
;i.e. running from main if accessing main, running from aux if accessing aux
allow_saplings=1 ;enable support for saplings
allow_trees = 0 ;enable support for tree files, as opposed to only seedlings and saplings
;required in RWTS mode if file > 128kb
fast_trees = 0 ;keep tree block in memory, requires an additional 512 bytes of RAM
always_trees = 0 ;set to 1 if the only file access involves tree files
;not compatible with allow_subdir, allow_saplings
;required in RWTS mode if allow_trees is enabled
detect_treof = 0 ;detect EOF during read of tree files
fast_subindex= 0 ;keep subindex block in memory, requires an additional 512 bytes of RAM
;halves the disk access for double the speed (ideal for RWTS mode)
allow_sparse = 1 ;enable support for reading sparse files
;recommended if enable_write is enabled, to prevent writing to sparse blocks
bounds_check = 1 ;set to 1 to prevent access beyond the end of the file
;but limits file size to 64k-2 bytes.
return_size = 0 ;set to 1 to receive file size on open in read-only mode
one_shot = 0 ;set to 1 to load entire file in one pass (avoids the need to specify size)
no_interrupts= 0 ;set to 1 to disable interrupts across calls
detect_err = 0 ;set to 1 to to detect errors in no_interrupt mode
swap_zp = 0 ;set to 1 to include code to preserve zpage
;used only by RWTS mode
swap_scrn = 1 ;set to 1 to preserve screen hole contents across SmartPort calls
;reading directly into screen memory that includes holes (either main or aux) is not recommended
;because SCSI firmware writes there (i.e. whichever bank is active) on exit, which will damage read content
;recommended if allow_aux is used, to avoid device reset
;requires 64 bytes to save all holes
rwts_mode = 0 ;set to 1 to enable emulation of DOS RWTS when running from hard disk
;uses a one-time open of a tree file, no other file access allowed
;use unique volume numbers to distinguish between images in the same file
;requires override_adr, allow_trees, always_trees
;not compatible with enable_floppy, allow_subdir, might_exist, bounds_check
mem_swap = 0 ;set to 1 if zpage can be swapped between main and aux, and swap_zp is unsuitable
;(caches index registers in code instead of zpage)
load_high = 0 ;set to 1 to load to top of RAM (either main or banked, enables a himem check)
load_aux = 0 ;load to aux memory
load_banked = 1 ;set to 1 to load into banked RAM instead of main RAM (can be combined with load_aux for aux banked)
lc_bank = 2 ;load into specified bank (1 or 2) if load_banked=1
one_page = 0 ;set to 1 if verbose mode says that you should (smaller code)
;user-defined driver load address
!if load_banked = 1 {
!if load_high = 1 {
!ifdef PASS2 {
} else { ;PASS2 not defined
reloc = $fe00 ;page-aligned, as high as possible, the ideal value will be shown on mismatch
} ;PASS2
} else { ;load_high = 0
reloc = $d400 ;page-aligned, but otherwise wherever you want
} ;load_high = 1
} else { ;load_banked = 0
!if load_high = 1 {
!ifdef PASS2 {
} else { ;PASS2 not defined
reloc = $bf00 ;page-aligned, as high as possible, the ideal value will be shown on mismatch
} ;PASS2
} else { ;load_high = 0
reloc = $bc00 ;page-aligned, but otherwise wherever you want ($BC00 is common for rwts_mode)
} ;load_high = 1
} ;load_banked = 1
;there are also buffers that can be moved if necessary:
;dirbuf, encbuf, treebuf (and corresponding hdd* versions that load to the same place)
;they are independent of each other so they can be placed separately
;see near EOF for those
;note that hddencbuf must be even-page-aligned in RWTS-mode
;zpage usage, arbitrary selection except for the "ProDOS constant" ones
;feel free to move them around
!if (might_exist + poll_drive) > 0 {
status = $50 ;returns non-zero on error
} ;might_exist = 1 or poll_drive = 1
!if allow_aux = 1 {
auxreq = $51 ;set to 1 to read/write aux memory, else main memory is used
} ;allow_aux = 1
sizelo = $52 ;set if enable_write=1 and writing, or reading, or if enable_seek=1 and seeking
sizehi = $53 ;set if enable_write=1 and writing, or reading, or if enable_seek=1 and seeking
!if (enable_write + enable_seek + allow_multi + rwts_mode) > 0 {
reqcmd = $54 ;set (read/write/seek) if enable_write=1 or enable_seek=1
;if allow_multi=1, bit 7 selects floppy drive in current slot (clear=drive 1, set=drive 2) during open call
;bit 7 must be clear for read/write/seek on opened file
} ;enable_write = 1 or enable_seek = 1 or allow_multi = 1 or rwts_mode = 1
ldrlo = $55 ;set to load address if override_adr=1
ldrhi = $56 ;set to load address if override_adr=1
namlo = $57 ;name of file to access
namhi = $58 ;name of file to access
ldrlo2 = $59 ;original load address read from filesystem
ldrhi2 = $5a ;original load address read from filesystem
sizelo2 = $5b ;original file size read from filesystem
sizehi2 = $5c ;original file size read from filesystem
!set last_zp = $5c ;highest address to save if swap_zp enabled (max 127 entries later)
!if enable_floppy = 1 {
tmpsec = $3c ;(internal) sector number read from disk
reqsec = $3d ;(internal) requested sector number
curtrk = $40 ;(internal) track number read from disk
} ;enable_floppy = 1
command = $42 ;ProDOS constant
unit = $43 ;ProDOS constant
adrlo = $44 ;ProDOS constant
adrhi = $45 ;ProDOS constant
bloklo = $46 ;ProDOS constant
blokhi = $47 ;ProDOS constant
scratchlo = $48 ;(internal)
scratchhi = $49 ;(internal)
entries = $3f ;(internal) total number of entries in directory
!if many_files = 1 {
entrieshi = $3b ;(internal) total number of entries in directory
} ;many_files = 1
!if mem_swap = 0 {
!if rwts_mode = 1 {
lasttree = $59 ;(internal) last used index in tree buffer
} ;rwts_mode = 1
!if allow_trees = 1 {
treeidx = $5a ;(internal) index into tree block
!set last_zp = $5a ;highest address to save if swap_zp enabled (max 127 entries later)
!if always_trees = 0 {
istree = $5b ;(internal) flag to indicate tree file
} ;always_trees = 0
!if fast_trees = 0 {
treeblklo = $5c
treeblkhi = $5d
!set last_zp = $5d ;highest address to save if swap_zp enabled (max 127 entries later)
} ;fast_trees = 0
} ;allow_trees = 1
blkidx = $5e ;(internal) index into sapling block list
!if rwts_mode = 1 {
lastblk = $5f ;(internal) previous index into sapling block list
!set last_zp = $5f ;highest address to save if swap_zp enabled (max 127 entries later)
} ;rwts_mode = 1
!if (bounds_check + return_size + one_shot) > 0 {
bleftlo = $60 ;(internal) bytes left in file
} ;bounds_check = 1 or return_size = 1 or one_shot = 1
!if (bounds_check + return_size + aligned_read + one_shot) > 0 {
blefthi = $61 ;(internal) bytes left in file
!set last_zp = $61 ;highest address to save if swap_zp enabled (max 127 entries later)
} ;bounds_check = 1 or return_size = 1 or aligned_read = 1 or one_shot = 1
!if aligned_read = 0 {
blkofflo = $62 ;(internal) offset within cache block
blkoffhi = $63 ;(internal) offset within cache block
!set last_zp = $63 ;highest address to save if swap_zp enabled (max 127 entries later)
} ;aligned_read = 0
} ;mem_swap = 0
!if enable_floppy = 1 {
step = $64 ;(internal) state for stepper motor
tmptrk = $65 ;(internal) temporary copy of current track
phase = $66 ;(internal) current phase for seek
!set last_zp = $66 ;highest address to save if swap_zp enabled (max 127 entries later)
} ;enable_floppy = 1
;constants
cmdseek = 0 ;requires enable_seek=1
cmdread = 1 ;requires enable_write=1
cmdwrite = 2 ;requires enable_write=1
SETKBD = $fe89
SETVID = $fe93
DEVNUM = $bf30
PHASEOFF = $c080
MOTOROFF = $c088
MOTORON = $c089
DRV0EN = $c08a
Q6L = $c08c
Q6H = $c08d
Q7L = $c08e
Q7H = $c08f
MLI = $bf00
NAME_LENGTH = $4 ;ProDOS constant
MASK_SUBDIR = $d0 ;ProDOS constant
MASK_ALL = $f0 ;ProDOS constant
KEY_POINTER = $11 ;ProDOS constant
EOF_LO = $15 ;ProDOS constant
EOF_HI = $16 ;ProDOS constant
AUX_TYPE = $1f ;ProDOS constant
ENTRY_SIZE = $27 ;ProDOS constant
NEXT_BLOCK_LO = $2 ;ProDOS constant
NEXT_BLOCK_HI = $3 ;ProDOS constant
SAPLING = $20 ;ProDOS constant
FILE_COUNT = $25 ;ProDOS constant
DEVADR01HI = $bf11 ;ProDOS constant
ROMIN = $c081
LCBANK2 = $c089
CLRAUXRD = $c002
CLRAUXWR = $c004
SETAUXWR = $c005
CLRAUXZP = $c008
SETAUXZP = $c009
first_zp = $40 ;lowest address to save if swap_zp enabled
;last_zp is calculated automatically
D1S1 = 1 ;disk 1 side 1 volume ID if rwts_mode enabled
init lda DEVNUM
sta x80_parms + 1
sta unrunit1 + 1
and #$70
!if (enable_floppy + enable_write) > 1 {
sta unrslot1 + 1
sta unrslot2 + 1
sta unrslot3 + 1
sta unrslot4 + 1
} ;enable_floppy = 1 and enable_write = 1
pha
!if enable_floppy = 1 {
ora #<PHASEOFF
sta unrseek + 1
ora #<MOTOROFF
!if allow_multi = 1 {
sta unrdrvoff1 + 1
} ;allow_multi = 1
!if (might_exist + poll_drive) > 0 {
sta unrdrvoff2 + 1
} ;might_exist = 1 or poll_drive = 1
!if (aligned_read + allow_aux) = 0 {
sta unrdrvoff3 + 1
} ;aligned_read = 0 and allow_aux = 0
sta unrdrvoff4 + 1
tax
inx ;MOTORON
!if allow_multi = 1 {
stx unrdrvon1 + 1
} ;allow_multi = 1
stx unrdrvon2 + 1
!if aligned_read = 0 {
stx unrdrvon3 + 1
} ;aligned_read = 0
stx unrdrvon4 + 1
inx ;DRV0EN
!if allow_multi = 1 {
stx unrdrvsel2 + 1
} ;allow_multi = 1
inx
!if allow_multi = 1 {
stx unrdrvsel1 + 1
} ;allow_multi = 1
inx ;Q6L
stx unrread1 + 1
!if (poll_drive + allow_multi) > 0 {
stx unrread2 + 1
stx unrread3 + 1
} ;poll_drive = 1 or allow_multi = 1
stx unrread4 + 1
stx unrread5 + 1
!if check_chksum = 1 {
stx unrread6 + 1
} ;check_chksum = 1
} ;enable_floppy = 1
ldx #1
stx namlo
inx
stx namhi
;fetch path, if any
jsr MLI
!byte $c7
!word c7_parms
ldx $200
dex
stx sizelo
sec
bmi +++
;find current directory name in directory
php
readblock jsr MLI
!byte $80
!word x80_parms
lda #<(readbuff + NAME_LENGTH)
sta scratchlo
lda #>(readbuff + NAME_LENGTH)
sta scratchhi
inextent ldy #0
lda (scratchlo), y
pha
and #$0f
tax
-- iny
lda (scratchlo), y
cmp (namlo), y
beq ifoundname
;match failed, move to next directory in this block, if possible
- pla
skiphdr clc
lda scratchlo
adc #ENTRY_SIZE
sta scratchlo
bcc +
;there can be only one page crossed, so we can increment instead of adc
inc scratchhi
+ cmp #<(readbuff + $1ff) ;4 + ($27 * $0d)
lda scratchhi
sbc #>(readbuff + $1ff)
bcc inextent
;read next directory block when we reach the end of this block
lda readbuff + NEXT_BLOCK_LO
ldx readbuff + NEXT_BLOCK_HI
bcs +
ifoundname dex
bne --
;parse path until last directory is seen
iny
lda (namlo), y
cmp #'/'
bne -
pla
and #$20 ;Volume Directory Header XOR subdirectory
beq adjpath
pla
clc
php
lsr
bcc skiphdr
inx
adjpath tya
eor #$ff
adc sizelo
sta sizelo
clc
tya
adc namlo
sta namlo
dex
beq ++
;cache block number of current directory
;as starting position for subsequent searches
ldy #(KEY_POINTER + 1)
lda (scratchlo), y
tax
dey
lda (scratchlo), y
!if enable_floppy = 1 {
sta unrblocklo + 1
stx unrblockhi + 1
} ;enable_floppy = 1
sta unrhddblocklo + 1
stx unrhddblockhi + 1
+ sta x80_parms + 4
stx x80_parms + 5
++ lda sizelo
bne readblock
pla
;unit to slot for ProDOS interface
+++ pla
lsr
lsr
lsr
tay
ldx DEVADR01HI, y
cpx #$c8
bcc set_slot1
!if use_smartport = 1 {
php
} ;use_smartport = 1
!if enable_floppy = 1 {
;check if current device is floppy
lsr
ora #$c0
tax
stx scratchhi
ldy #0
sty scratchlo
iny
lda (scratchlo), y
cmp #$20
bne not_floppy
iny
iny
lda (scratchlo), y
bne not_floppy
iny
iny
lda (scratchlo), y
cmp #3
bne not_floppy
ldy #$ff
lda (scratchlo), y
beq set_slot1
not_floppy
} ;enable_floppy = 1
;find SmartPort device for basic MicroDrive support
ldx #$c8
- dex
stx scratchhi
ldy #0
sty scratchlo
iny
lda (scratchlo), y
cmp #$20
bne -
iny
iny
lda (scratchlo), y
bne -
iny
iny
lda (scratchlo), y
cmp #3
bne -
ldy #$ff
lda (scratchlo), y
beq -
!if use_smartport = 1 {
set_slot plp
} ;use_smartport = 1
set_slot1 stx slot + 2
stx unrentry + 2
slot ldx $cfff
stx unrentry + 1
!if enable_floppy = 1 {
php
} ;enable_floppy = 1
!if use_smartport = 1 {
!if enable_floppy = 1 {
beq +
} ;enable_floppy = 1
bcs ++
+ jmp bankram
++ lda #$8c ;STY
!if (rwts_mode + enable_write) > 1 {
sta unrcommand1
} ;rwts_mode = 1 and enable_write = 1
sta unrcommand3
lda #<pcommand
!if (rwts_mode + enable_write) > 1 {
sta unrcommand1 + 1
} ;rwts_mode = 1 and enable_write = 1
!if (rwts_mode + aligned_read + (enable_write xor 1)) = 0 {
sta unrcommand2 + 1
} ;rwts_mode = 0 and aligned_read = 0 and enable_write = 1
sta unrcommand3 + 1
lda #>pcommand
!if (rwts_mode + enable_write) > 1 {
sta unrcommand1 + 2
} ;rwts_mode = 1 and enable_write = 1
!if (rwts_mode + aligned_read + (enable_write xor 1)) = 0 {
sta unrcommand2 + 2
} ;rwts_mode = 0 and aligned_read = 0 and enable_write = 1
sta unrcommand3 + 2
lda #$8e ;STX
!if (rwts_mode + aligned_read + (enable_write xor 1)) = 0 {
sta unrcommand2
} ;rwts_mode = 0 and aligned_read = 0 and enable_write = 1
sta unrbloklo
lda #<pblock
sta unrbloklo + 1
lda #>pblock
sta unrbloklo + 2
lda #$8d ;STA
sta unrblokhi
lda #<(pblock + 1)
sta unrblokhi + 1
lda #>(pblock + 1)
sta unrblokhi + 2
lda #$a5 ;LDA
sta unrunit1
lda #adrlo
sta unrunit1 + 1
lda #$8d ;STA
sta unrunit1 + 2
lda #<paddr
sta unrunit1 + 3
lda #>paddr
sta unrunit1 + 4
;use SmartPort entrypoint instead
inx
inx
inx
stx unrentry + 1
ldx #2
stx x80_parms + 4
lda #0
sta x80_parms + 5
jsr MLI
!byte $80
!word x80_parms
lda #cmdread
sta unrpcommand
lda #$ea
sta hackstar
iterunit inc unrunit2
jsr unrentry
bcs iterunit
+ ldy #$10
- lda readbuff + 3, y
cmp readbuff + $203, y
bne iterunit
dey
bne -
lda #$68
sta hackstar
lda #<packet
sta unrppacket
lda #>packet
sta unrppacket + 1
} ;use_smartport = 1
bankram
!if load_banked = 1 {
lda LCBANK2 + 2 - ((lc_bank - 1) * 8)
lda LCBANK2 + 2 - ((lc_bank - 1) * 8)
} ;load_banked = 1
!if load_aux = 1 {
sta SETAUXWR + (load_banked * 4) ;SETAUXWR or SETAUXZP
} ;load_aux = 1
!if enable_floppy = 1 {
ldx #>unrelocdsk
ldy #<unrelocdsk
plp
php
beq copydrv
ldx #>unrelochdd
ldy #<unrelochdd
copydrv stx scratchhi
sty scratchlo
ldx #>((codeend - rdwrpart) + $ff)
ldy #0
- lda (scratchlo), y
reladr sta reloc, y
iny
bne -
inc scratchhi
inc reladr + 2
dex
bne -
plp
bne ++
;build 6-and-2 denibbilisation table
ldx #$16
-- stx scratchlo
txa
asl
bit scratchlo
beq +
ora scratchlo
eor #$ff
and #$7e
- bcs +
lsr
bne -
tya
sta nibtbl - $16, x
!if enable_write = 1 {
;and 6-and-2 nibbilisation table if writing
txa
ora #$80
sta xlattbl, y
} ;enable_write = 1
iny
+ inx
bpl --
unrdrvon1 lda MOTORON
jsr readadr
lda curtrk
sta trackd1
!if allow_multi = 1 {
unrdrvsel1 lda DRV0EN + 1
jsr spinup
jsr poll
bcs +
lda #$c8 ;iny
sta twodrives
inc driveind + 1
jsr readadr
lda curtrk
sta trackd2
+
} ;allow_multi = 1
unrdrvoff1 lda MOTOROFF
++
} else { ;enable_floppy = 0
ldy #0
- lda unrelochdd, y
sta reloc, y
!if one_page = 0 {
;hack to avoid address overflow when load_high and load_banked
;and code is less than two pages long (e.g. aligned_read, no write)
;can't insert code during pass two because it breaks existing offsets
lda unrelochdd + $100, y
sta reloc + $100, y
lda unrelochdd + $200, y
sta reloc + $200, y
} ;one_page = 0
iny
bne -
} ;enable_floppy = 1
!if swap_scrn = 1 {
jsr saveslot
lda #$91
sta initpatch
} ;swap_scrn = 1
!if load_aux = 1 {
sta CLRAUXWR + (load_banked * 4) ;CLRAUXWR or CLRAUXZP
} ;load_aux = 1
!if rwts_mode = 1 {
;read volume directory key block
;self-modified by init code
hddopendir
unrhddblocklo = *
ldx #2
unrhddblockhi = *
lda #0
hddreaddir1 jsr hddreaddirsel
hddfirstent lda #NAME_LENGTH
sta scratchlo
lda #>(hdddirbuf - 1)
sta scratchhi
;there can be only one page crossed, so we can increment here
hddnextent1 inc scratchhi
hddnextent ldy #0
;match name lengths before attempting to match names
lda (scratchlo), y
and #$0f
tax
inx
- cmp filename, y
beq hddfoundname
;match failed, move to next entry in this block, if possible
+ clc
lda scratchlo
adc #ENTRY_SIZE
sta scratchlo
bcs hddnextent1
cmp #$ff ;4 + ($27 * $0d)
bne hddnextent
;read next directory block when we reach the end of this block
ldx hdddirbuf + NEXT_BLOCK_LO
lda hdddirbuf + NEXT_BLOCK_HI
bcs hddreaddir1
hddfoundname iny
lda (scratchlo), y
dex
bne -
!if ((swap_zp xor 1) + mem_swap) > 0 {
!if allow_trees = 1 {
stx treeidx
sty lasttree ;guarantee no match
} ;allow_trees = 1
stx blkidx
sty lastblk ;guarantee no match
} else { ;swap_zp = 1 and mem_swap = 0
!if allow_trees = 1 {
stx zp_array + treeidx - first_zp
sty zp_array + lasttree - first_zp ;guarantee no match
} ;allow_trees = 0
stx zp_array + blkidx - first_zp
sty zp_array + lastblk - first_zp ;guarantee no match
} ;swap_zp = 0 or mem_swap = 1
!if allow_trees = 1 {
;fetch KEY_POINTER
ldy #KEY_POINTER
lda (scratchlo), y
!if fast_trees = 0 {
!if ((swap_zp xor 1) + mem_swap) > 0 {
sta treeblklo
} else { ;swap_zp = 1 and mem_swap = 0
sta zp_array + treeblklo - first_zp
} ;swap_zp = 0 or mem_swap = 1
} else { ;fast_trees = 1
tax
} ;fast_trees = 0
iny
lda (scratchlo), y
!if fast_trees = 0 {
!if ((swap_zp xor 1) + mem_swap) > 0 {
sta treeblkhi
} else { ;swap_zp = 1 and mem_swap = 0
sta zp_array + treeblkhi - first_zp
} ;swap_zp = 0 or mem_swap = 1
} else { ;fast_trees = 1
ldy #>hddtreebuf
jsr hddreaddirsect
} ;fast_trees = 0
} ;allow_trees = 1
lda #>iob
ldy #<iob
jsr reloc
inc sect
inc addr + 1
lda #>iob
ldy #<iob
jsr reloc
jmp $b700
filename !byte filename_e-filename_b
filename_b !text "DISKIMAGE"
filename_e
iob !byte 0, 0, 0, 0
trak !byte 0
sect !byte 0
!byte 0, 0
addr !byte 0, $b6
!byte 0, 0, 1, 0, 0
} else { ;rwts_mode = 0
rts
} ;rwts_mode = 1
c7_parms !byte 1
!word $200
x80_parms !byte 3, $d1
!word readbuff, 2
!if enable_floppy = 1 {
unrelocdsk
!pseudopc reloc {
rdwrpart
!if (enable_readseq + allow_subdir) > 0 {
jmp rdwrfile
} ;enable_readseq = 1 or allow_subdir = 1
opendir
!if no_interrupts = 1 {
!if detect_err = 1 {
clc
} ;detect_err = 1
php
sei
jsr +
!if detect_err = 1 {
pla
adc #0
pha
} ;detect_err = 1
plp
rts
+
} ;no_interrupts = 1
;read volume directory key block
;self-modified by init code
unrblocklo = unrelocdsk + (* - reloc)
ldx #2
unrblockhi = unrelocdsk + (* - reloc)
lda #0
jsr readdirsel
readdir ;note that calling this location directly limits subdirectories to 14 entries!
lda #NAME_LENGTH + ENTRY_SIZE
firstent sta scratchlo
lda #>(dirbuf - 1)
sta scratchhi
!if might_exist = 1 {
lda dirbuf + FILE_COUNT ;assuming only 256 files per subdirectory
sta entries
!if many_files = 1 {
lda dirbuf + FILE_COUNT + 1
sta entrieshi
} ;many_files = 1
} ;might_exist = 1
;there can be only one page crossed, so we can increment here
nextent1 inc scratchhi
nextent ldy #0
!if (might_exist + allow_subdir + allow_saplings + (always_trees xor 1)) > 0 {
lda (scratchlo), y
!if might_exist = 1 {
sty status
;skip deleted entries without counting
and #MASK_ALL
beq +
} ;might_exist = 1
!if (allow_subdir + allow_saplings + (always_trees xor 1)) > 0 {
;remember type
;now bits 5-4 are represented by carry (subdirectory), sign (sapling)
asl
asl
!if allow_trees = 1 {
;now bits 5-3 are represented by carry (subdirectory), sign (sapling),
;overflow (seedling), and sign+overflow (tree)
sta treeidx
bit treeidx
} ;allow_trees = 1
php
} ;allow_subdir = 1 or allow_saplings = 1 or always_trees = 0
} ;might_exist = 1 or allow_subdir = 1 or allow_saplings = 1 or always_trees = 0
;match name lengths before attempting to match names
lda (scratchlo), y
and #$0f
tax
inx
- cmp (namlo), y
beq foundname
;match failed, check if any directory entries remain
!if (allow_subdir + allow_saplings + (always_trees xor 1)) > 0 {
plp
} ;allow_subdir = 1 or allow_saplings = 1 or always_trees = 0
!if might_exist = 1 {
dec entries
bne +
!if many_files = 1 {
lda entrieshi
bne ++
} ;many_files = 1
} ;might_exist = 1
!if (might_exist + poll_drive) > 0 {
nodisk
unrdrvoff2 = unrelocdsk + (* - reloc)
lda MOTOROFF
inc status
rts
} ;might_exist = 1 or poll_drive = 1
!if (might_exist + many_files) > 1 {
++ dec entrieshi
} ;might_exist = 1 and many_files = 1
;move to next entry in this block, if possible
+ clc
lda scratchlo
adc #ENTRY_SIZE
sta scratchlo
bcs nextent1
cmp #$ff ;4 + ($27 * $0d)
bne nextent
;read next directory block when we reach the end of this block
ldx dirbuf + NEXT_BLOCK_LO
lda dirbuf + NEXT_BLOCK_HI
jsr readdirsec
lda #NAME_LENGTH
bne firstent
foundname iny
lda (scratchlo), y
dex
bne -
;initialise essential variables
!if allow_trees = 1 {
stx treeidx
!if always_trees = 0 {
stx istree
} ;always_trees = 0
} ;allow_trees = 1
stx blkidx
!if (aligned_read + one_shot) = 0 {
stx blkofflo
stx blkoffhi
} ;aligned_read = 0 and one_shot = 0
!if enable_write = 1 {
!if aligned_read = 0 {
ldy reqcmd
cpy #cmdwrite ;control carry instead of zero
bne +
} ;aligned_read = 0
!if one_shot = 0 {
;round requested size up to nearest block if writing
lda sizelo
adc #$fe
lda sizehi
adc #1
and #$fe
sta sizehi
!if aligned_read = 0 {
stx sizelo
!if bounds_check = 1 {
sec
} ;bounds_check = 1
} ;aligned_read = 0
} ;one_shot = 0
+
} ;enable_write = 1
!if (bounds_check + return_size + one_shot) > 0 {
;cache EOF (file size, loaded backwards)
ldy #EOF_HI
lda (scratchlo), y
!if (enable_write + aligned_read) > 0 {
tax
dey ;EOF_LO
lda (scratchlo), y
;round file size up to nearest block if writing without aligned reads
;or always if using aligned reads
!if aligned_read = 0 {
bcc +
} else { ;aligned_read = 1
!if enable_write = 1 {
sec
} ;enable_write = 1
} ;aligned_read = 0
adc #$fe
txa
adc #1
and #$fe
!if aligned_read = 0 {
tax
lda #0
!if one_shot = 0 {
+ stx blefthi
sta bleftlo
} else { ;one_shot = 1
+ stx sizehi
sta sizelo
} ;one_shot = 0
} else { ;aligned_read = 1
!if one_shot = 0 {
sta blefthi
} else { ;one_shot = 1
sta sizehi
} ;one_shot = 0
} ;aligned_read = 0
} else { ;enable_write = 0 and aligned_read = 0
!if one_shot = 0 {
sta blefthi
} else { ;one_shot = 1
sta sizehi
} ;one_shot = 0
dey ;EOF_LO
lda (scratchlo), y
!if one_shot = 0 {
sta bleftlo
} else { ;one_shot = 1
sta sizelo
} ;one_shot = 0
} ;enable_write = 1 or aligned_read = 1
} ;bounds_check = 1 or return_size = 1 or one_shot = 1
;cache AUX_TYPE (load offset for binary files)
!if override_adr = 0 {
ldy #AUX_TYPE
lda (scratchlo), y
!if (allow_subdir + allow_saplings + allow_trees + (aligned_read xor 1)) > 0 {
sta ldrlo
iny
lda (scratchlo), y
sta ldrhi
} else { ;allow_subdir = 0 and allow_saplings = 0 and allow_trees = 0 and aligned_read = 1
pha
iny
lda (scratchlo), y
pha
} ;allow_subdir = 1 or allow_saplings = 1 or allow_trees = 1 or aligned_read = 0
} ;override_adr = 0
;cache KEY_POINTER
ldy #KEY_POINTER
lda (scratchlo), y
tax
!if (allow_subdir + allow_saplings + allow_trees) > 0 {
sta dirbuf
!if (allow_trees + (fast_trees xor 1)) > 1 {
sta treeblklo
} ;allow_trees = 1 and fast_trees = 0
iny
lda (scratchlo), y
sta dirbuf + 256
!if (allow_trees + (fast_trees xor 1)) > 1 {
sta treeblkhi
} ;allow_trees = 1 and fast_trees = 0
!if always_trees = 0 {
plp
bpl ++
!if allow_subdir = 1 {
php
} ;allow_subdir = 1
!if allow_trees = 1 {
ldy #>dirbuf
bvc +
!if fast_trees = 1 {
ldy #>treebuf
} ;fast_trees = 1
sty istree
+
} ;allow_trees = 1
} else { ;always_trees = 1
ldy #>treebuf
} ;always_trees = 0
} else { ;allow_subdir = 0 and allow_saplings = 0 and allow_trees = 0
iny
lda (scratchlo), y
} ;allow_subdir = 1 or allow_saplings = 1 or allow_trees = 1
;read index block in case of sapling or tree
jsr readdirsect
!if allow_subdir = 1 {
plp
} ;allow_subdir = 1
++
;skip some stuff
;drive is on already
;and interrupt control is in place
jmp rdwrfilei
rdwrfile
unrdrvon2 = unrelocdsk + (* - reloc)
lda MOTORON
!if allow_subdir = 1 {
clc
} ;allow_subdir = 1
!if no_interrupts = 1 {
!if detect_err = 1 {
!if allow_subdir = 0 {
clc
} ;allow_subdir = 0
} ;detect_err = 1
php
sei
jsr +
!if detect_err = 1 {
pla
adc #0
pha
} ;detect_err = 1
plp
rts
+
} ;no_interrupts = 1
rdwrfilei
!if (override_adr + allow_subdir + allow_saplings + allow_trees + (aligned_read xor 1)) > 0 {
;restore load offset
ldx ldrhi
lda ldrlo
!if allow_subdir = 1 {
;check file type and fake size and load address for subdirectories
bcc +
ldy #2
sty sizehi
ldx #>dirbuf
lda #0
!if aligned_read = 0 {
sta sizelo
} ;aligned_read = 0
+
} ;allow_subdir = 1
sta adrlo
stx adrhi
} else { ;override_adr = 0 and allow_subdir = 0 and allow_saplings = 0 and allow_trees = 0 and aligned_read = 1
pla
sta adrhi
pla
sta adrlo
} ;override_adr = 1 or allow_subdir = 1 or allow_saplings = 1 or allow_trees = 1 or aligned_read = 0
;set requested size to min(length, requested size)
!if aligned_read = 0 {
!if bounds_check = 1 {
ldy bleftlo
cpy sizelo
lda blefthi
tax
sbc sizehi
bcs copyblock
sty sizelo
stx sizehi
} ;bounds_check = 1
copyblock
!if allow_aux = 1 {
ldx auxreq
jsr setaux
} ;allow_aux = 1
!if one_shot = 0 {
!if enable_write = 1 {
lda reqcmd
lsr
bne rdwrloop
} ;enable_write = 1
;if offset is non-zero then we return from cache
lda blkofflo
tax
ora blkoffhi
beq rdwrloop
lda sizehi
pha
lda sizelo
pha
lda adrhi
sta scratchhi
lda adrlo
sta scratchlo
stx adrlo
lda #>encbuf
clc
adc blkoffhi
sta adrhi
;determine bytes left in block
lda #1
sbc blkofflo
tay
lda #2
sbc blkoffhi
tax
;set requested size to min(bytes left, requested size)
cpy sizelo
sbc sizehi
bcs +
sty sizelo
stx sizehi
+
!if enable_seek = 1 {
lda sizehi
} else { ;enable_seek = 0
ldy sizehi
} ;enable_seek = 1
jsr copycache
unrdrvon3 = unrelocdsk + (* - reloc)
lda MOTORON ;copycache turns it off
;align to next block and resume read
lda ldrlo
adc sizelo
sta ldrlo
lda ldrhi
adc sizehi
sta ldrhi
sec
pla
sbc sizelo
sta sizelo
pla
sbc sizehi
sta sizehi
ora sizelo
!if allow_subdir = 1 {
!if no_interrupts = 1 {
clc
bne rdwrfilei
} else { ;no_interrupts = 0
bne rdwrfile
} ;no_interrupts = 1
} else { ;allow_subdir = 0
bne rdwrfilei
} ;allow_subdir = 1
!if allow_aux = 0 {
unrdrvoff3 = unrelocdsk + (* - reloc)
lda MOTOROFF
rts
} else { ;allow_aux = 1
beq rdwrdonedrv
} ;allow_aux = 0
} ;one_shot = 0
} else { ;aligned_read = 1
!if bounds_check = 1 {
lda blefthi
cmp sizehi
bcs +
sta sizehi
+
} ;bounds_check = 1
!if allow_aux = 1 {
ldx auxreq
jsr setaux
} ;allow_aux = 1
} ;aligned_read = 0
rdwrloop
!if aligned_read = 0 {
!if (enable_write + enable_seek) > 0 {
ldx reqcmd
} ;enable_write = 1 or enable_seek = 1
;set read/write size to min(length, $200)
lda sizehi
cmp #2
bcs +
pha
;redirect read to private buffer for partial copy
lda adrhi
pha
lda adrlo
pha
lda #>encbuf
sta adrhi
!if ver_02 = 1 {
ldx #0
stx adrlo
!if (enable_write + enable_seek) > 0 {
inx ;ldx #cmdread
} ;enable_write = 1 or enable_seek = 1
} else { ;ver_02 = 0
stz adrlo
!if (enable_write + enable_seek) > 0 {
ldx #cmdread
} ;enable_write = 1 or enable_seek = 1
} ;ver_02 = 1
+
} ;aligned_read = 0
!if allow_trees = 1 {
;read tree data block only if tree and not read already
;the indication of having read already is that at least one sapling/seed block entry has been read, too
ldy blkidx
bne +
!if always_trees = 0 {
lda istree
beq +
} ;always_trees = 0
lda adrhi
pha
lda adrlo
pha
!if ((aligned_read xor 1) + (enable_write or enable_seek)) > 1 {
!if ver_02 = 1 {
txa
pha
} else { ;ver_02 = 0
phx
} ;ver_02 = 1
} ;aligned_read = 0 and (enable_write = 1 or enable_seek = 1)
!if aligned_read = 0 {
php
} ;aligned_read = 0
lda #>dirbuf
sta adrhi
sty adrlo
;fetch tree data block and read it
!if fast_trees = 0 {
ldx treeblklo
lda treeblkhi
jsr readdirsel
} ;fast_trees = 0
ldy treeidx
inc treeidx
ldx treebuf, y
lda treebuf + 256, y
!if detect_treof = 1 {
bne noteof1
tay
txa
bne fixy1
!if aligned_read = 0 {
plp
bcs fewpop
pla
pla
pla
fewpop
} ;aligned_read = 0
pla
pla
sec
rts
fixy1 tya
noteof1
} ;detect_treof = 1
!if fast_trees = 0 {
jsr seekrd
} else { ;fast_trees = 1
jsr readdirsel
} ;fast_trees = 0
!if aligned_read = 0 {
plp
} ;aligned_read = 0
!if ((aligned_read xor 1) + (enable_write or enable_seek)) > 1 {
!if ver_02 = 1 {
pla
tax
} else { ;ver_02 = 0
plx
} ;ver_02 = 1
} ;aligned_read = 0 and (enable_write = 1 or enable_seek = 1)
pla
sta adrlo
pla
sta adrhi
} ;allow_trees = 1
;fetch data block and read/write it
skiptree ldy blkidx
+ inc blkidx
!if aligned_read = 0 {
!if enable_seek = 1 {
txa ;cpx #cmdseek, but that would require php at top
beq +
} ;enable_seek = 1
!if enable_write = 1 {
stx command
} ;enable_write = 1
} ;aligned_read = 0
ldx dirbuf, y
lda dirbuf + 256, y
!if detect_treof = 1 {
bne noteof2
tay
txa
bne fixy2
sec
rts
fixy2 tya
noteof2
} ;detect_treof = 1
!if allow_sparse = 1 {
pha
ora dirbuf, y
tay
pla
dey
iny ;don't affect carry
} ;allow_sparse = 1
!if aligned_read = 0 {
php
} ;aligned_read = 0
!if allow_sparse = 1 {
beq issparse
} ;allow_sparse = 1
!if (aligned_read and (enable_write or enable_seek)) = 1 {
ldy reqcmd
!if enable_seek = 1 {
beq +
} ;enable_seek = 1
} ;aligned_read = 1 and (enable_write = 1 or enable_seek = 1)
!if enable_write = 1 {
jsr seekrdwr
} else { ;enable_write = 0
jsr seekrd
} ;enable_write = 1
resparse
!if aligned_read = 0 {
plp
+ bcc +
!if bounds_check = 1 {
dec blefthi
dec blefthi
} ;bounds_check = 1
} ;aligned_read = 0
dec sizehi
dec sizehi
bne rdwrloop
rdwrdonedrv
unrdrvoff4 = unrelocdsk + (* - reloc)
lda MOTOROFF
!if aligned_read = 0 {
lda sizelo
bne rdwrloop
} ;aligned_read = 0
rdwrdone
!if allow_aux = 1 {
ldx #0
setaux sta CLRAUXRD, x
sta CLRAUXWR, x
} ;allow_aux = 1
rts
!if allow_sparse = 1 {
issparse
- sta (adrlo), y
iny
bne -
inc adrhi
- sta (adrlo), y
iny
bne -
dec adrhi
bne resparse
} ;allow_sparse = 1
!if aligned_read = 0 {
;cache partial block offset
+ pla
sta scratchlo
pla
sta scratchhi
pla
!if one_shot = 0 {
sta sizehi
} ;one_shot = 0
dec adrhi
dec adrhi
!if enable_seek = 1 {
copycache
ldy reqcmd
;cpy #cmdseek
beq ++
tay
} else { ;enable_seek = 0
tay
copycache
} ;enable_seek = 1
beq +
dey
- lda (adrlo), y
sta (scratchlo), y
iny
bne -
inc scratchhi
inc adrhi
bne +
- lda (adrlo), y
sta (scratchlo), y
iny
+ cpy sizelo
bne -
++
!if one_shot = 0 {
!if bounds_check = 1 {
lda bleftlo
sec
sbc sizelo
sta bleftlo
lda blefthi
sbc sizehi
sta blefthi
} ;bounds_check = 1
clc
!if enable_seek = 1 {
lda sizelo
} else { ;enable_seek = 0
tya
} ;enable_seek = 1
adc blkofflo
sta blkofflo
lda sizehi
adc blkoffhi
and #$fd
sta blkoffhi
bcc rdwrdone ;always
} else { ;one_shot = 1
rts
} ;one_shot = 0
} ;aligned_read = 0
spinup ldy #6
- jsr delay
dey
bpl -
delay
-- ldx #$11
- dex
bne -
sec
sbc #1
bne --
rts
;no tricks here, just the regular stuff
seek ldy #0
sty step
asl phase
txa
asl
copy_cur tax
sta tmptrk
sec
sbc phase
beq +++
bcs +
!if ver_02 = 1 {
eor #$ff
} else { ;ver_02 = 0
inc
} ;ver_02 = 1
inx
bcc ++
+
!if ver_02 = 1 {
sbc #1
} else { ;ver_02 = 0
dec
} ;ver_02 = 1
dex
++ cmp step
bcc +
lda step
+ cmp #8
bcs +
tay
sec
+
!if ver_02 = 1 {
txa
pha
} else { ;ver_02 = 0
phx
} ;ver_02 = 1
ldx step1, y
+++ php
bne +
--- clc
lda tmptrk
ldx step2, y
+ stx tmpsec
and #3
rol
tax
lsr
unrseek = unrelocdsk + (* - reloc)
lda PHASEOFF, x
-- ldx #$12
- dex
bpl -
dec tmpsec
bne --
bcs ---
plp
beq seekret
pla
inc step
bne copy_cur
step1 !byte 1, $30, $28, $24, $20, $1e, $1d, $1c
step2 !byte $70, $2c, $26, $22, $1f, $1e, $1d, $1c
readadr
- jsr readd5aa
cmp #$96
bne -
ldy #3
- sta curtrk
jsr readnib
rol
sta tmpsec
jsr readnib
and tmpsec
dey
bne -
seekret rts
readd5aa
-- jsr readnib
- cmp #$d5
bne --
jsr readnib
cmp #$aa
bne -
tay ;we need Y=#$AA later
readnib
unrread1 = unrelocdsk + (* - reloc)
- lda Q6L
bpl -
rts
!if (poll_drive + allow_multi) > 0 {
poll ldy #0
unrread2 = unrelocdsk + (* - reloc)
- lda Q6L
jsr seekret
pha
pla
unrread3 = unrelocdsk + (* - reloc)
cmp Q6L
clc
bne +
dey
bne -
sec
+ rts
} ;poll_drive = 1 or allow_multi = 1
readdirsel
!if ver_02 = 1 {
pha
txa
pha
} else { ;ver_02
pha
phx
} ;ver_02 = 1
unrdrvon4 = unrelocdsk + (* - reloc)
lda MOTORON
!if (ver_02 + allow_multi) > 0 {
ldy #0
sty adrlo
!if poll_drive = 1 {
sty status
} ;poll_drive = 1
} else { ;ver_02 = 0 and allow_multi = 0
stz adrlo
!if poll_drive = 1 {
stz status
} ;poll_drive = 1
} ;ver_02 = 1 or allow_multi = 1
!if allow_multi = 1 {
asl reqcmd
bcc seldrive
twodrives nop ;replace with INY if drive exists
seldrive lsr reqcmd
unrdrvsel2 = unrelocdsk + (* - reloc)
lda DRV0EN, y
cpy driveind + 1
sty driveind + 1
beq nodelay
jsr spinup
nodelay
} ;allow_multi = 1
!if poll_drive = 1 {
jsr poll
bcc +
pla
pla
pla
pla
jmp nodisk
+
} ;poll_drive = 1
!if ver_02 = 1 {
pla
tax
pla
} else { ;ver_02
plx
pla
} ;ver_02 = 1
readdirsec
!if allow_trees = 0 {
readdirsect ldy #>dirbuf
} else { ;allow_trees = 1
ldy #>dirbuf
readdirsect
} ;allow_trees = 1
sty adrhi
seekrd ldy #cmdread
!if (aligned_read + enable_write) > 1 {
seekrdwr sty command
} else { ;aligned_read = 0 or enable_write = 0
sty command
seekrdwr
} ;aligned_read = 1 and enable_write = 1
;convert block number to track/sector
lsr
txa
ror
lsr
lsr
sta phase
txa
and #3
php
asl
plp
rol
sta reqsec
driveind ldy #0
ldx trackd1, y
;if track does not match, then seek
cpx phase
beq checksec
lda phase
sta trackd1, y
jsr seek
;match or read/write sector
checksec jsr cmpsecrd
inc reqsec
inc reqsec
cmpsecrd jsr readadr
!if enable_write = 1 {
ldy command
cpy #cmdwrite ;we need Y=2 below
beq encsec
} ;enable_write = 1
cmp reqsec
bne cmpsecrd
;read sector data
jsr readd5aa
eor #$ad ;zero A if match
bne cmpsecrd
unrread4 = unrelocdsk + (* - reloc)
- ldx Q6L
bpl -
eor nibtbl - $96, x
sta bit2tbl - $aa, y
iny
bne -
unrread5 = unrelocdsk + (* - reloc)
- ldx Q6L
bpl -
eor nibtbl - $96, x
sta (adrlo), y ;the real address
iny
bne -
!if check_chksum = 1 {
unrread6 = unrelocdsk + (* - reloc)
- ldx Q6L
bpl -
eor nibtbl - $96, x
bne cmpsecrd
} ;check_chksum = 1
-- ldx #$a9
- inx
beq --
lda (adrlo), y
lsr bit2tbl - $aa, x
rol
lsr bit2tbl - $aa, x
rol
sta (adrlo), y
iny
bne -
inc adrhi
rts
!if enable_write = 1 {
encsec
-- ldx #$aa
- dey
lda (adrlo), y
lsr
rol bit2tbl - $aa, x
lsr
rol bit2tbl - $aa, x
sta encbuf, y
lda bit2tbl - $aa, x
and #$3f
sta bit2tbl - $aa, x
inx
bne -
tya
bne --
cmpsecwr jsr readadr
cmp reqsec
bne cmpsecwr
;skip tail #$DE #$AA #$EB some #$FFs ...
ldy #6
- jsr readnib
dey
bpl -
;write sector data
unrslot1 = unrelocdsk + (* - reloc)
ldx #$d1
lda Q6H, x ;prime drive
lda Q7L, x ;required by Unidisk
tya
sta Q7H, x
ora Q6L, x
pha ;3 cycles
pla ;4 cycles
nop ;2 cycles
;40 cycles
ldy #4 ;2 cycles
pha ;3 cycles
pla ;4 cycles
nop ;2 cycles
loopchk1
- jsr writenib1 ;(29 cycles)
;+6 cycles
dey ;2 cycles
bne - ;3 cycles if taken, 2 if not
;36 cycles
;+10 cycles
ldy #(prolog_e - prolog)
;2 cycles
!if >loopchk1 != >* {
!serious "loop1 crosses a page"
}
cmp $ea ;3 cycles
loopchk2
- lda prolog - 1, y ;4 cycles
jsr writenib2 ;(17 cycles)
;32 cycles if branch taken
;+6 cycles
dey ;2 cycles
bne - ;3 cycles if taken, 2 if not
;36 cycles on first pass
;+10 cycles
tya ;2 cycles
!if >loopchk2 != >* {
!serious "loop2 crosses a page"
}
ldy #$56 ;2 cycles
loopchk3
- eor bit2tbl - 1, y ;5 cycles
tax ;2 cycles
lda xlattbl, x ;4 cycles
unrslot2 = unrelocdsk + (* - reloc)
ldx #$d1 ;2 cycles
sta Q6H, x ;5 cycles
lda Q6L, x ;4 cycles
;32 cycles if branch taken
lda bit2tbl - 1, y ;5 cycles
dey ;2 cycles
bne - ;3 cycles if taken, 2 if not
;32 cycles
;+9 cycles
clc ;2 cycles
!if >loopchk3 != >* {
!serious "loop3 crosses a page"
}
loopchk4
-- eor encbuf, y ;4 cycles
loopchk5
- tax ;2 cycles
lda xlattbl, x ;4 cycles
unrslot3 = unrelocdsk + (* - reloc)
ldx #$d1 ;2 cycles
sta Q6H, x ;5 cycles
lda Q6L, x ;4 cycles
bcs + ;3 cycles if taken, 2 if not
;32 cycles if branch taken
lda encbuf, y ;4 cycles
loopchk6 ;belongs to the "bcs +" above
iny ;2 cycles
bne -- ;3 cycles if taken, 2 if not
;32 cycles
;+10 cycles
sec ;2 cycles
!if >loopchk4 != >* {
!serious "loop4 crosses a page"
}
bcs - ;3 cycles
;32 cycles
;+3 cycles
!if >loopchk6 != >* {
!serious "loop6 crosses a page"
}
+ ldy #(epilog_e - epilog)
;2 cycles
!if >loopchk5 != >* {
!serious "loop5 crosses a page"
}
nop ;2 cycles
nop ;2 cycles
nop ;2 cycles
loopchk7
- lda epilog - 1, y ;4 cycles
jsr writenib2 ;(17 cycles)
;32 cycles if branch taken
;+6 cycles
dey ;2 cycles
bne - ;3 cycles if branch taken, 2 if not
lda Q7L, x
!if >loopchk7 != >* {
!serious "loop7 crosses a page"
}
lda Q6L, x ;flush final value
inc adrhi
rts
writenib1 jsr writeret ;6 cycles
writenib2
unrslot4=unrelocdsk+(*-reloc)
ldx #$d1 ;2 cycles
sta Q6H, x ;5 cycles
ora Q6L, x ;4 cycles
writeret rts ;6 cycles
prolog !byte $ad, $aa, $d5
prolog_e
!if >(prolog - 1) != >prolog_e {
!serious "prologue crosses a page"
}
epilog !byte $ff, $eb, $aa, $de
epilog_e
!if >(epilog - 1) != >epilog_e {
!serious "epilogue crosses a page"
}
} ;enable_write = 1
codeend
trackd1 !byte 0
trackd2 !byte 0
bit2tbl = (* + 255) & -256
nibtbl = bit2tbl + 86
!if enable_write = 1 {
xlattbl = nibtbl + 106
dataend = xlattbl + 64
} else { ;enable_write = 0
dataend = nibtbl + 106
} ;enable_write = 1
} ;enable_floppy = 1
} ;reloc
unrelochdd
!pseudopc reloc {
!if rwts_mode = 1 {
!if no_interrupts = 1 {
php
sei
jsr +
plp
rts
+
} ;no_interrupts = 1
!if swap_zp = 1 {
jsr swap_zpg
} ;swap_zp = 1
sta namhi
sty namlo
!if ver_02 = 1 {
lda #0
sta sizehi
} else { ;ver_02
stz sizehi
} ;ver_02 = 1
!if enable_format = 1 {
ldy #$0c ;command
lda (namlo),y
cmp #2 ;write (or format if greater)
php
bcc skipinit ;read
beq skipinit ;write
ldy #5 ;sector
!if ver_02 = 1 {
txa
} else { ;ver_02
lda #0
} ;ver_02 = 1
sta (namlo),y
dey ;track
sta (namlo),y
skipinit
} ;enable_format = 1
!if allow_multi = 1 {
ldy #3 ;volume
lda (namlo),y
!if allow_zerovol = 1 {
bne +
lastvol = * + 1
lda #D1S1
+ sta lastvol
} ;allow_zerovol = 1
ldy #$0e ;returned volume
sta (namlo),y
ldx #vollist_e-vollist_b
- dex
cmp vollist_b,x
bne -
} ;allow_multi = 1
ldy #4 ;track
lda (namlo),y
asl
asl
asl
rol sizehi
asl
rol sizehi
iny ;sector
ora (namlo),y
!if allow_multi = 1 {
ldy sizehi
- dex
bmi ++
clc
adc #$30
bcc +
iny
+ iny
iny
bne -
++
} ;allow_multi = 1
!if allow_trees = 1 {
tax
!if allow_multi = 1 {
tya
} else { ;allow_multi = 0
lda sizehi
} ;allow_multi = 1
lsr
sta treeidx
txa
} else { ;allow_trees = 0
lsr sizehi
} ;allow_trees = 1
ror
php
jsr seek1
plp
!if fast_subindex = 0 {
lda #>hddencbuf
adc #0
sta adrhi
} else { ;fast_subindex = 1
bcc +
inc adrhi
+
} ;fast_subindex = 0
ldy #9 ;adrhi
lda (namlo),y
sta scratchhi
dey ;adrlo
lda (namlo),y
sta scratchlo
!if enable_format = 1 {
ldy #0
ldx #0
plp
bcs runinit
} else { ;enable_format = 0
!if enable_write = 1 {
ldy #$0c ;command
lda (namlo),y
ldy #0
lsr
bne runinit
} else { ;enable_write = 0
ldy #0
} ;enable_write = 1
} ;enable_format = 1
- lda (adrlo),y
sta (scratchlo),y
iny
bne -
!if swap_zp = 0 {
clc
rts
} else { ;swap_zp = 1
!if enable_write = 1 {
beq swap_zpg
} ;enable_write = 1
} ;swap_zp = 0
!if enable_write = 1 {
runinit
!if enable_format = 1 {
bne format
} ;enable_format = 1
- lda (scratchlo),y
sta (adrlo),y
iny
bne -
lda adrhi
and #$fe
sta adrhi
ldy #cmdwrite
unrcommand1 = unrelochdd + (* - reloc)
sty command
!if use_smartport = 1 {
nop ;allow replacing "sty command" with "sty pcommand" in extended SmartPort mode
} ;use_smartport = 1
!if swap_zp = 1 {
jsr hddwriteimm
!if enable_format = 1 {
bcc swap_zpg ;always
} ;enable_format = 1
} else { ;swap_zp = 0
jmp hddwriteimm
} ;swap_zp = 1
!if enable_format = 1 {
clrcarry clc
inc adrhi
format lda blanksec,x
sta (adrlo),y
inx
txa
and #7
tax
iny
bne format
bcs clrcarry
dex
stx lasttree
iny
lda #$18 ;blocks
sta namlo
sty namhi
lda adrhi
and #$fe
sta adrhi
lda #cmdwrite
sta reqcmd
inc lastblk ;force mismatch
- jsr hddrdwrloop
inc blkidx
bne +
inc treeidx
+ dec namlo
bne -
dec namhi
bpl -
} ;enable_format = 1
} ;enable_write = 1
!if swap_zp = 1 {
swap_zpg pha
tya
pha
ldx #(last_zp - first_zp)
- lda first_zp,x
ldy zp_array,x
sta zp_array,x
sty first_zp,x
dex
bpl -
pla
tay
pla
} ;swap_zp = 1
!if (enable_write + swap_zp) > 0 {
!if no_interrupts = 0 {
clc
} ;no_interrupts = 0
rts
} ;enable_write = 1 or swap_zp = 1
!if enable_format = 1 {
blanksec !text "SAN INC."
} ;enable_format = 1
seek1 sta blkidx
!if enable_write = 1 {
lda #cmdread
sta reqcmd
} ;enable_write = 1
} else { ;rwts_mode = 0
hddopendir
!if no_interrupts = 1 {
!if detect_err = 1 {
clc
} ;detect_err = 1
php
sei
jsr +
!if detect_err = 1 {
pla
adc #0
pha
} ;detect_err = 1
plp
rts
+
} ;no_interrupts = 1
;read volume directory key block
;self-modified by init code
unrhddblocklo = unrelochdd + (* - reloc)
ldx #2
unrhddblockhi = unrelochdd + (* - reloc)
lda #0
jsr hddreaddirsel
!if enable_floppy = 1 {
!if (* - hddopendir) < (readdir - opendir) {
;essential padding to match offset with floppy version
!fill (readdir - opendir) - (* - hddopendir), $ea
}
} ;enable_floppy = 1
hddreaddir ;note that calling this location directly limits subdirectories to 14 entries!
lda #NAME_LENGTH + ENTRY_SIZE
hddfirstent sta scratchlo
dirbufpatch1
lda #>(hdddirbuf - 1)
sta scratchhi
!if might_exist = 1 {
lda hdddirbuf + FILE_COUNT ;assuming only 256 files per subdirectory
sta entries
!if many_files = 1 {
lda hdddirbuf + FILE_COUNT + 1
sta entrieshi
} ;many_files = 1
} ;might_exist = 1
;there can be only one page crossed, so we can increment here
hddnextent1 inc scratchhi
hddnextent ldy #0
!if (might_exist + allow_subdir + allow_saplings + (always_trees xor 1)) > 0 {
lda (scratchlo), y
!if might_exist = 1 {
sty status
;skip deleted entries without counting
and #MASK_ALL
beq +
} ;might_exist = 1
!if (allow_subdir + allow_saplings + (always_trees xor 1)) > 0 {
;remember type
;now bits 5-4 are represented by carry (subdirectory), sign (sapling)
asl
asl
!if allow_trees = 1 {
;now bits 5-3 are represented by carry (subdirectory), sign (sapling),
;overflow (seedling), and sign+overflow (tree)
sta treeidx
bit treeidx
} ;allow_trees = 1
php
} ;allow_subdir = 1 or allow_saplings = 1 or always_trees = 0
} ;might_exist = 1 or allow_subdir = 1 or allow_saplings = 1 or always_trees = 0
;match name lengths before attempting to match names
lda (scratchlo), y
and #$0f
tax
inx
- eor (namlo), y
asl
beq hddfoundname
;match failed, check if any directory entries remain
!if (allow_subdir + allow_saplings + (always_trees xor 1)) > 0 {
plp
} ;allow_subdir = 1 or allow_saplings = 1 or always_trees = 0
!if might_exist = 1 {
dec entries
bne +
!if many_files = 1 {
lda entrieshi
bne ++
} ;many_files = 1
inc status
rts
!if many_files = 1 {
++ dec entrieshi
} ;many_files = 1
} ;might_exist = 1
;move to next entry in this block, if possible
+ clc
lda scratchlo
adc #ENTRY_SIZE
sta scratchlo
bcs hddnextent1
cmp #$ff ;4 + ($27 * $0d)
bne hddnextent
;read next directory block when we reach the end of this block
dirbufpatch2
ldx hdddirbuf + NEXT_BLOCK_LO
dirbufpatch3
lda hdddirbuf + NEXT_BLOCK_HI
jsr hddreaddirsec
lda #NAME_LENGTH
bne hddfirstent
hddfoundname iny
lda (scratchlo), y
dex
bne -
;initialise essential variables
!if allow_trees = 1 {
stx treeidx
!if always_trees = 0 {
stx istree
} ;always_trees = 0
} ;allow_trees = 1
stx blkidx
!if (aligned_read + one_shot) = 0 {
stx blkofflo
stx blkoffhi
} ;aligned_read = 0 and one_shot = 0
!if enable_write = 1 {
!if aligned_read = 0 {
ldy reqcmd
cpy #cmdwrite ;control carry instead of zero
bne +
} ;aligned_read = 0
!if one_shot = 0 {
;round requested size up to nearest block if writing
lda sizelo
adc #$fe
lda sizehi
adc #1
and #$fe
sta sizehi
!if aligned_read = 0 {
stx sizelo
!if bounds_check = 1 {
sec
} ;bounds_check = 1
} ;aligned_read = 0
} ;one_shot = 0
+
} ;enable_write = 1
!if (bounds_check + return_size + one_shot) > 0 {
;cache EOF (file size, loaded backwards)
ldy #EOF_HI
lda (scratchlo), y
!if (enable_write + aligned_read) > 0 {
tax
dey ;EOF_LO
lda (scratchlo), y
;round file size up to nearest block if writing without aligned reads
;or always if using aligned reads
!if aligned_read = 0 {
bcc +
} else { ;aligned_read = 1
!if enable_write = 1 {
sec
} ;enable_write = 1
} ;aligned_read = 0
adc #$fe
txa
adc #1
and #$fe
!if aligned_read = 0 {
tax
lda #0
!if one_shot = 0 {
+ stx blefthi
sta bleftlo
} else { ;one_shot = 1
+ stx sizehi
sta sizelo
} ;one_shot = 0
} else { ;aligned_read = 1
!if one_shot = 0 {
sta blefthi
} else { ;one_shot = 1
sta sizehi
} ;one_shot = 0
} ;aligned_read = 0
} else { ;enable_write = 0 and aligned_read = 0
!if one_shot = 0 {
sta blefthi
} else { ;one_shot = 1
sta sizehi
} ;one_shot = 0
dey ;EOF_LO
lda (scratchlo), y
!if one_shot = 0 {
sta bleftlo
} else { ;one_shot = 1
sta sizelo
} ;one_shot = 0
} ;enable_write = 1 or aligned_read = 1
} ;bounds_check = 1 or return_size = 1 or one_shot = 1
;cache AUX_TYPE (load offset for binary files)
!if override_adr = 0 {
ldy #AUX_TYPE
lda (scratchlo), y
!if (allow_subdir + allow_saplings + allow_trees + (aligned_read xor 1)) > 0 {
sta ldrlo
iny
lda (scratchlo), y
sta ldrhi
} else { ;allow_subdir = 0 and allow_saplings = 0 and allow_trees = 0 and aligned_read = 1
pha
iny
lda (scratchlo), y
pha
} ;allow_subdir = 1 or allow_saplings = 1 or allow_trees = 1 or aligned_read = 0
} ;override_adr = 0
;;allow query even in override mode
ldy #AUX_TYPE
lda (scratchlo), y
sta ldrlo2
iny
lda (scratchlo), y
sta ldrhi2
;cache KEY_POINTER
ldy #KEY_POINTER
lda (scratchlo), y
tax
!if (allow_subdir + allow_saplings + allow_trees) > 0 {
dirbufpatch4
sta hdddirbuf
!if (allow_trees + (fast_trees xor 1)) > 1 {
sta treeblklo
} ;allow_trees = 1 and fast_trees = 0
iny
lda (scratchlo), y
dirbufpatch5
sta hdddirbuf + 256
!if (allow_trees + (fast_trees xor 1)) > 1 {
sta treeblkhi
} ;allow_trees = 1 and fast_trees = 0
!if always_trees = 0 {
plp
attribpatch
bpl ++
!if allow_subdir = 1 {
php
} ;allow_subdir = 1
!if allow_trees = 1 {
ldy #>hdddirbuf
bvc +
!if fast_trees = 1 {
ldy #>hddtreebuf
} ;fast_trees = 1
sty istree
+
} ;allow_trees = 1
} else { ;always_trees = 1
ldy #>hddtreebuf
} ;always_trees = 0
} else { ;allow_subdir = 0 and allow_saplings = 0 and allow_trees = 0
iny
lda (scratchlo), y
} ;allow_subdir = 1 or allow_saplings = 1 or allow_trees = 1
;read index block in case of sapling or tree
jsr hddreaddirsect
!if allow_subdir = 1 {
plp
bcs hddrdwrfilei
} ;allow_subdir = 1
++
} ;rwts_mode = 1
hddrdwrpart
hddrdfile
hddrdwrfile
lda #$ff
sta sizehi2
hddrdwrfilex
!if allow_subdir = 1 {
clc
} ;allow_subdir = 1
!if (no_interrupts + (rwts_mode xor 1)) > 1 {
!if detect_err = 1 {
!if allow_subdir = 0 {
clc
} ;allow_subdir = 0
} ;detect_err = 1
php
sei
jsr +
!if detect_err = 1 {
pla
adc #0
pha
} ;detect_err = 1
plp
rts
+
} ;no_interrupts = 1 and rwts_mode = 0
hddrdwrfilei
!if rwts_mode = 0 {
!if (override_adr + allow_subdir + allow_saplings + allow_trees + (aligned_read xor 1)) > 0 {
;restore load offset
ldx ldrhi
lda ldrlo
!if allow_subdir = 1 {
;check file type and fake size and load address for subdirectories
bcc +
ldy #2
sty sizehi
dirbufpatch6
ldx #>hdddirbuf
lda #0
!if aligned_read = 0 {
sta sizelo
} ;aligned_read = 0
+
} ;allow_subdir = 1
sta adrlo
stx adrhi
} else { ;override_adr = 0 and allow_subdir = 0 and allow_saplings = 0 and allow_trees = 0 and aligned_read = 1
pla
sta adrhi
pla
sta adrlo
} ;override_adr = 1 or allow_subdir = 1 or allow_saplings = 1 or allow_trees = 1 or aligned_read = 0
;set requested size to min(length, requested size)
!if aligned_read = 0 {
!if bounds_check = 1 {
ldy bleftlo
cpy sizelo
lda blefthi
tax
sbc sizehi
bcs hddcopyblock
sty sizelo
stx sizehi
} ;bounds_check = 1
hddcopyblock
ldx sizehi2
inx
bne +
lda sizehi
sta sizehi2
lda sizelo
sta sizelo2
+
!if allow_aux = 1 {
ldx auxreq
jsr hddsetaux
} ;allow_aux = 1
!if one_shot = 0 {
!if enable_write = 1 {
lda reqcmd
lsr
bne hddrdwrloop
} ;enable_write = 1
;if offset is non-zero then we return from cache
lda blkofflo
tax
ora blkoffhi
beq hddrdwrloop
lda sizehi
pha
lda sizelo
pha
lda adrhi
sta scratchhi
lda adrlo
sta scratchlo
stx adrlo
encbufpatch1
lda #>hddencbuf
clc
adc blkoffhi
sta adrhi
;determine bytes left in block
lda #1
sbc blkofflo
tay
lda #2
sbc blkoffhi
tax
;set requested size to min(bytes left, requested size)
cpy sizelo
sbc sizehi
bcs +
sty sizelo
stx sizehi
+
!if enable_seek = 1 {
lda sizehi
} else { ;enable_seek = 0
ldy sizehi
} ;enable_seek = 1
jsr hddcopycache
;align to next block and resume read
lda ldrlo
adc sizelo
sta ldrlo
lda ldrhi
adc sizehi
sta ldrhi
sec
pla
sbc sizelo
sta sizelo
pla
sbc sizehi
sta sizehi
ora sizelo
!if allow_subdir = 1 {
!if no_interrupts = 1 {
clc
bne hddrdwrfilei
} else { ;no_interrupts = 0
beq hddrdwrdone
jmp hddrdwrfilex
} ;no_interrupts = 1
} else { ;allow_subdir = 0
bne hddrdwrfilei
} ;allow_subdir = 1
!if allow_aux = 0 {
rts
} else { ;allow_aux = 1
beq hddrdwrdone
} ;allow_aux = 0
} ;one_shot = 0
} else { ;aligned_read = 1
!if bounds_check = 1 {
lda blefthi
cmp sizehi
bcs +
sta sizehi
+
} ;bounds_check = 1
!if allow_aux = 1 {
ldx auxreq
jsr hddsetaux
} ;allow_aux = 1
} ;aligned_read = 0
} ;rwts_mode = 0
hddrdwrloop
!if (aligned_read + rwts_mode) = 0 {
!if (enable_write + enable_seek) > 0 {
ldx reqcmd
} ;enable_write = 1 or enable_seek = 1
;set read/write size to min(length, $200)
lda sizehi
cmp #2
bcs +
pha
;redirect read to private buffer for partial copy
lda adrhi
pha
lda adrlo
pha
encbufpatch2
lda #>hddencbuf
sta adrhi
!if ver_02 = 1 {
ldx #0
stx adrlo
!if (enable_write + enable_seek) > 0 {
inx ;ldx #cmdread
} ;enable_write = 1 or enable_seek = 1
} else { ;ver_02 = 0
stz adrlo
!if (enable_write + enable_seek) > 0 {
ldx #cmdread
} ;enable_write = 1 or enable_seek = 1
} ;ver_02 = 1
+
} ;aligned_read = 0 and rwts_mode = 0
!if allow_trees = 1 {
;read tree data block only if tree and not read already
;the indication of having read already is that at least one sapling/seed block entry has been read, too
!if rwts_mode = 0 {
ldy blkidx
bne +
!if always_trees = 0 {
lda istree
beq +
} ;always_trees = 0
lda adrhi
pha
lda adrlo
pha
!if ((aligned_read xor 1) + (enable_write or enable_seek)) > 1 {
!if ver_02 = 1 {
txa
pha
} else { ;ver_02 = 0
phx
} ;ver_02 = 1
} ;aligned_read = 0 and (enable_write = 1 or enable_seek = 1)
!if aligned_read = 0 {
php
} ;aligned_read = 0
lda #>hdddirbuf
sta adrhi
sty adrlo
} else { ;rwts_mode = 1
!if fast_subindex = 0 {
;read whenever block index changes
!if mem_swap = 0 {
ldy blkidx
cpy lastblk
} else { ;mem_swap = 1
blkidx = * + 1
ldy #$d1
lastblk = * + 1
cpy #$d1
} ;mem_swap = 0
sty lastblk
php
pla
!if mem_swap = 0 {
;read whenever tree index changes
ldy treeidx
cpy lasttree
} else { ;mem_swap = 1
treeidx = * + 1
ldy #$d1
lasttree = * + 1
cpy #$d1
} ;mem_swap = 0
sty lasttree
bne readtree
pha
plp
beq skipblk
readtree
} else { ;fast_subindex = 1
;read whenever tree index changes
!if mem_swap = 0 {
ldy treeidx
cpy lasttree
beq hddskiptree
sty lasttree
ldx blkidx
} else { ;mem_swap = 1
treeidx = * + 1
ldy #$d1
lasttree = * + 1
cpy #$d1
beq hddskiptree
sty lasttree
blkidx = * + 1
ldx #$d1
} ;mem_swap = 0
inx
stx lastblk
} ;fast_subindex = 0
} ;rwts_mode = 0
;fetch tree data block and read it
!if fast_trees = 0 {
ldx treeblklo
lda treeblkhi
jsr hddreaddirsel
ldy treeidx
!if rwts_mode = 0 {
inc treeidx
} ;rwts_mode = 0
ldx hdddirbuf, y
lda hdddirbuf + 256, y
} else { ;fast_trees = 1
ldy treeidx
!if rwts_mode = 0 {
inc treeidx
} ;rwts_mode = 0
ldx hddtreebuf, y
lda hddtreebuf + 256, y
} ;fast_trees = 0
!if detect_treof = 1 {
bne hddnoteof1
tay
txa
bne hddfixy1
!if aligned_read = 0 {
plp
bcs hddfewpop
pla
pla
pla
hddfewpop
} ;aligned_read = 0
pla
pla
sec
rts
hddfixy1 tya
hddnoteof1
} ;detect_treof = 1
!if fast_trees = 0 {
jsr hddseekrd
} else { ;fast_trees = 1
jsr hddreaddirsel
} ;fast_trees = 0
!if rwts_mode = 0 {
!if aligned_read = 0 {
plp
} ;aligned_read = 0
!if ((aligned_read xor 1) + (enable_write or enable_seek)) > 1 {
!if ver_02 = 1 {
pla
tax
} else { ;ver_02 = 0
plx
} ;ver_02 = 1
} ;aligned_read = 0 and (enable_write = 1 or enable_seek = 1)
pla
sta adrlo
pla
sta adrhi
} ;rwts_mode = 0
} ;allow_trees = 1
;fetch data block and read/write it
hddskiptree ldy blkidx
!if rwts_mode = 0 {
+ inc blkidx
!if aligned_read = 0 {
!if enable_seek = 1 {
txa ;cpx #cmdseek, but that would require php at top
beq +
} ;enable_seek = 1
!if enable_write = 1 {
unrcommand2 = unrelochdd + (* - reloc)
stx command
!if use_smartport = 1 {
nop ;allow replacing "stx command" with "stx pcommand" in extended SmartPort mode
} ;use_smartport = 1
} ;enable_write = 1
} ;aligned_read = 0
} else { ;rwts_mode = 1
!if fast_subindex = 1 {
lda #>hddencbuf
sta adrhi
;read whenever block index changes
!if mem_swap = 0 {
cpy lastblk
} else { ;mem_swap = 1
lastblk = * + 1
cpy #$d1
} ;mem_swap = 0
beq skipblk
sty lastblk
} ;fast_subindex = 1
} ;rwts_mode = 0
dirbufpatch7
ldx hdddirbuf, y
dirbufpatch8
lda hdddirbuf + 256, y
!if detect_treof = 1 {
bne hddnoteof2
tay
txa
bne hddfixy2
sec
rts
hddfixy2 tya
hddnoteof2
} ;detect_treof = 1
!if allow_sparse = 0 {
!if rwts_mode = 1 {
!if enable_write = 0 {
jmp hddseekrd
} else { ;enable_write = 1
ldy reqcmd
jmp hddseekrdwr
} ;enable_write = 0
} ;rwts_mode = 1
} else { ;allow_sparse = 1
pha
dirbufpatch9
ora hdddirbuf, y
tay
pla
!if rwts_mode = 0 {
dey
iny ;don't affect carry
} else { ;rwts_mode = 1
!if enable_write = 1 {
cpy #1
ldy reqcmd
bcs hddseekrdwr
tay
} else { ;enable_write = 0
dey
iny ;don't affect carry
bne hddseekrd
} ;enable_write = 1
} ;rwts_mode = 0
} ;allow_sparse = 0
!if rwts_mode = 0 {
!if aligned_read = 0 {
php
} ;aligned_read = 0
!if allow_sparse = 1 {
beq hddissparse
} ;allow_sparse = 1
!if (aligned_read and (enable_write or enable_seek)) = 1 {
ldy reqcmd
!if enable_seek = 1 {
beq +
} ;enable_seek = 1
} ;aligned_read = 1 and (enable_write = 1 or enable_seek = 1)
!if enable_write = 1 {
jsr hddseekrdwr
} else { ;enable_write = 0
jsr hddseekrd
} ;enable_write = 1
hddresparse
!if aligned_read = 0 {
plp
+ bcc +
!if bounds_check = 1 {
dec blefthi
dec blefthi
} ;bounds_check = 1
} ;aligned_read = 0
inc adrhi
inc adrhi
dec sizehi
dec sizehi
bne hddrdwrloop
!if aligned_read = 0 {
lda sizelo
bne hddrdwrloop
} ;aligned_read = 0
hddrdwrdone
!if allow_aux = 1 {
ldx #0
hddsetaux sta CLRAUXRD, x
sta CLRAUXWR, x
} ;allow_aux = 1
rts
} ;rwts_mode = 0
!if allow_sparse = 1 {
hddissparse
- sta (adrlo), y
inc adrhi
sta (adrlo), y
dec adrhi
iny
bne -
!if rwts_mode = 0 {
beq hddresparse
} else { ;rwts_mode = 1
skipblk rts
} ;rwts_mode = 0
} ;allow_sparse = 1
!if rwts_mode = 0 {
!if aligned_read = 0 {
;cache partial block offset
+ pla
sta scratchlo
pla
sta scratchhi
pla
!if one_shot = 0 {
sta sizehi
} ;one_shot = 0
!if enable_seek = 1 {
hddcopycache
ldy reqcmd
;cpy #cmdseek
beq ++
tay
} else { ;enable_seek = 0
tay
hddcopycache
} ;enable_seek = 1
beq +
dey
- lda (adrlo), y
sta (scratchlo), y
iny
bne -
inc scratchhi
inc adrhi
bne +
- lda (adrlo), y
sta (scratchlo), y
iny
+ cpy sizelo
bne -
++
!if one_shot = 0 {
!if bounds_check = 1 {
lda bleftlo
sec
sbc sizelo
sta bleftlo
lda blefthi
sbc sizehi
sta blefthi
} ;bounds_check = 1
clc
!if enable_seek = 1 {
lda sizelo
} else { ;enable_seek = 0
tya
} ;enable_seek = 1
adc blkofflo
sta blkofflo
lda sizehi
adc blkoffhi
and #$fd
sta blkoffhi
bcc hddrdwrdone ;always
} else { ;one_shot = 1
!if allow_aux = 1 {
beq hddrdwrdone
} else { ;allow_aux = 0
rts
} ;allow_aux = 1
} ;one_shot = 0
} ;aligned_read = 0
} else { ;rwts_mode = 1
!if allow_sparse = 0 {
skipblk rts
} ;allow_sparse = 0
} ;rwts_mode = 0
hddreaddirsel
!if ver_02 = 1 {
ldy #0
sty adrlo
!if might_exist = 1 {
sty status
} ;might_exist = 1
} else { ;ver_02 = 0
stz adrlo
!if might_exist = 1 {
stz status
} ;might_exist = 1
} ;ver_02 = 1
!if (enable_floppy + allow_multi) > 1 {
asl reqcmd
lsr reqcmd
} ;enable_floppy = 1 and allow_multi = 1
hddreaddirsec
!if allow_trees = 0 {
dirbufpatch10
hddreaddirsect ldy #>hdddirbuf
} else { ;allow_trees = 1
ldy #>hdddirbuf
hddreaddirsect
} ;allow_trees = 0
sty adrhi
hddseekrd ldy #cmdread
!if ((rwts_mode or aligned_read) + enable_write) > 1 {
hddseekrdwr
} ;(rwts_mode = 1 or aligned_read = 1) and enable_write = 1
unrcommand3 = unrelochdd + (* - reloc)
sty command
!if use_smartport = 1 {
nop ;allow replacing "sty command" with "sty pcommand" in extended SmartPort mode
} ;use_smartport = 1
!if (aligned_read and enable_write) = 0 {
hddseekrdwr
} ;aligned_read = 0 or enable_write = 0
unrbloklo = unrelochdd + (* - reloc)
stx bloklo
!if use_smartport = 1 {
nop ;allow replacing "stx bloklo" with "stx pblock" in extended SmartPort mode
} ;use_smartport = 1
unrblokhi = unrelochdd + (* - reloc)
sta blokhi
!if use_smartport = 1 {
nop ;allow replacing "sta blokhi" with "sta pblock + 1" in extended SmartPort mode
} ;use_smartport = 1
unrunit1 = unrelochdd + (* - reloc)
lda #$d1
sta unit
!if use_smartport = 1 {
nop ;allow replacing "lda #$d1/sta unit" with "lda adrlo/sta paddr" in extended SmartPort mode
} ;use_smartport = 1
hddwriteimm lda adrhi ;for Trackstar support
pha
!if use_smartport = 1 {
sta paddr + 1
} ;use_smartport = 1
!if swap_scrn = 1 {
jsr saveslot
} ;swap_scrn = 1
unrentry = unrelochdd + (* - reloc)
jsr $d1d1
!if use_smartport = 1 {
unrpcommand = unrelochdd + (* - reloc)
pcommand !byte $2c ;hide packet in non-SmartPort mode
unrppacket = unrelochdd + (* - reloc)
!word unrelochdd + (packet - reloc)
} ;use_smartport = 1
hackstar = unrelochdd + (* - reloc)
pla
sta adrhi ;Trackstar does not preserve adrhi
!if swap_scrn = 1 {
saveslot
lda #4
sta $49
ldx #0
stx $48
sta $4a
-- ldy #$78
- lda ($48), y
pha
lda scrn_array, x
initpatch lda ($48), y
pla
sta scrn_array, x
inx
tya
eor #$80
tay
bmi -
iny
bpl -
inc $49
dec $4a
bne --
} ;swap_scrn = 1
rts
!if use_smartport = 1 {
unrpacket = unrelochdd + (* - reloc)
packet !byte 3
unrunit2 = unrelochdd + (* - reloc)
!byte 0
paddr !word readbuff + $200
pblock !byte 2, 0, 0
} ;use_smartport = 1
!if (rwts_mode + allow_multi) > 1 {
vollist_b
!byte D1S1
vollist_e
} ;rwts_mode = 1 and allow_multi = 1
hddcodeend
!if swap_scrn = 1 {
scrn_array
!if swap_zp = 1 {
zp_array = scrn_array + 64
hdddataend = zp_array + last_zp - first_zp
} else { ;swap_zp = 0
hdddataend = scrn_array + 64
} ;swap_zp = 1
} else { ;swap_scrn = 0
!if swap_zp = 1 {
zp_array
hdddataend = zp_array + last_zp - first_zp
} else { ;swap_zp = 0
hdddataend
} ;swap_zp = 1
} ;swap_scrn = 1
} ;reloc
;[music] you can't touch this [music]
;math magic to determine ideal loading address, and information dump
!ifdef PASS2 {
} else { ;PASS2 not defined
!if enable_floppy = 1 {
!if reloc < $c000 {
!if ((dataend + $ff) & -256) > $c000 {
!serious "initial reloc too high, adjust to ", $c000 - (((dataend + $ff) & -256) - reloc)
} ;dataend
!if load_high = 1 {
!if ((dataend + $ff) & -256) != $c000 {
!warn "initial reloc too low, adjust to ", $c000 - (((dataend + $ff) & -256) - reloc)
} ;dataend
dirbuf = reloc - $200
!if ((aligned_read xor 1) + enable_write) > 0 {
encbuf = dirbuf - $200
} ;aligned_read = 0 or enable_write = 1
!if allow_trees = 1 {
!if fast_trees = 1 {
!if ((aligned_read xor 1) + enable_write) > 0 {
treebuf = encbuf - $200
} else { ;aligned_read = 1 and enable_write = 0
treebuf = dirbuf - $200
} ;aligned_read = 0 or enable_write = 1
} else { ;fast_trees = 0
treebuf = dirbuf
} ;fast_trees
} ;allow_trees
} else { ;load_high = 0
!pseudopc ((dataend + $ff) & -256) {
dirbuf = *
!if (dirbuf + $200) > $c000 {
!if dirbuf < $d000 {
!set dirbuf = reloc - $200
} ;dirbuf
} ;dirbuf
}
!if ((aligned_read xor 1) + enable_write) > 0 {
!if fast_subindex = 0 {
encbuf = dirbuf ;writes come from cache
} else { ;fast_subindex = 1
!if dirbuf < reloc {
encbuf = dirbuf - $200
} else { ;dirbuf
encbuf = dirbuf + $200
!if (encbuf + $200) > $c000 {
!if encbuf < $d000 {
!set encbuf = reloc - $200
} ;encbuf
} ;encbuf
} ;dirbuf
} ;fast_subindex
} ;aligned_read = 0 or enable_write = 1
!if allow_trees = 1 {
!if fast_trees = 1 {
!if ((aligned_read xor 1) + rwts_mode) > 0 {
!if encbuf < reloc {
treebuf = encbuf - $200
} else { ;encbuf
treebuf = encbuf + $200
!if (treebuf + $200) > $c000 {
!if treebuf < $d000 {
!set treebuf = reloc - $200
} ;treebuf
} ;treebuf
} ;encbuf
} else { ;aligned_read = 1 and rwts_mode = 0
!if dirbuf < reloc {
treebuf = dirbuf - $200
} else { ;dirbuf
treebuf = dirbuf + $200
!if (treebuf + $200) > $c000 {
!if treebuf < $d000 {
!set treebuf = reloc - $200
} ;treebuf
} ;treebuf
} ;dirbuf
} ;aligned_read = 0 or rwts_mode = 1
} else { ;fast_trees = 0
treebuf = dirbuf
} ;fast_trees
} ;allow_trees
} ;load_high
} else { ;reloc > $c000
!if ((dataend + $ff) & -256) != 0 {
!if ((dataend + $ff) & -256) < reloc {
!serious "initial reloc too high, adjust to ", (0 - (((dataend + $ff) & -256) - reloc)) & $ffff
} ;dataend
} ;dataend
!if load_high = 1 {
!if (((dataend + $ff) & -256) & $ffff) != 0 {
!warn "initial reloc too low, adjust to ", (0 - (((dataend + $ff) & -256) - reloc)) & $ffff
} ;dataend
dirbuf = reloc - $200
!if aligned_read = 0 {
encbuf = dirbuf - $200
} ;aligned_read
!if allow_trees = 1 {
!if fast_trees = 1 {
!if ((aligned_read xor 1) + enable_write) > 0 {
treebuf = encbuf - $200
} else { ;aligned_read = 1 and enable_write = 0
treebuf = dirbuf - $200
} ;aligned_read = 0 or enable_write = 1
} else { ;fast_trees = 0
treebuf = dirbuf
} ;fast_trees
} ;allow_trees
} else { ;load_high = 0
!pseudopc ((dataend + $ff) & -256) {
dirbuf = *
}
!if aligned_read = 0 {
encbuf = dirbuf + $200
} ;aligned_read
!if allow_trees = 1 {
!if fast_trees = 1 {
!if ((aligned_read xor 1) + enable_write) > 0 {
treebuf = encbuf + $200
} else { ;aligned_read = 1 and enable_write = 0
treebuf = dirbuf + $200
} ;aligned_read = 0 or enable_write = 1
} else { ;fast_trees = 0
treebuf = dirbuf
} ;fast_trees
} ;allow_trees
} ;load_high
} ;reloc
!if verbose_info = 1 {
!warn "floppy code: ", reloc, "-", codeend - 1
!warn "floppy data: ", bit2tbl, "-", dataend - 1
!warn "floppy dirbuf: ", dirbuf, "-", dirbuf + $1ff
!if aligned_read = 0 {
!warn "floppy encbuf: ", encbuf, "-", encbuf + $1ff
} ;aligned_read
!if allow_trees = 1 {
!warn "floppy treebuf: ", treebuf, "-", treebuf + $1ff
} ;allow_trees
!warn "floppy driver start: ", unrelocdsk - init
} ;verbose_info
} ;enable_floppy
!if reloc < $c000 {
!if ((hdddataend + $ff) & -256) > $c000 {
!serious "initial reloc too high, adjust to ", $c000 - (((hdddataend + $ff) & -256) - reloc)
} ;hdddataend
!if load_high = 1 {
!if ((hdddataend + $ff) & -256) != $c000 {
!warn "initial reloc too low, adjust to ", $c000 - (((hdddataend + $ff) & -256) - reloc)
} ;hdddataend
hdddirbuf = reloc - $200
!if aligned_read = 0 {
hddencbuf = hdddirbuf - $200
} ;aligned_read
!if allow_trees = 1 {
!if fast_trees = 1 {
!if ((aligned_read xor 1) + enable_write) > 0 {
hddtreebuf = hddencbuf - $200
} else { ;aligned_read = 1 and enable_write = 0
hddtreebuf = hdddirbuf - $200
} ;aligned_read = 0 or enable_write = 1
} else { ;fast_trees = 0
hddtreebuf = hdddirbuf
} ;fast_trees
} ;allow_trees
} else { ;load_high = 0
!pseudopc ((hdddataend + $ff) & -256) {
hdddirbuf = *
!if (hdddirbuf + $200) > $c000 {
!if hdddirbuf < $d000 {
!set hdddirbuf = reloc - $200
} ;hdddirbuf
} ;hdddirbuf
}
!if ((aligned_read xor 1) + rwts_mode) > 0 {
!if fast_subindex = 0 {
hddencbuf = hdddirbuf ;writes come from cache
} else { ;fast_subindex = 1
!if hdddirbuf < reloc {
hddencbuf = hdddirbuf - $200
} else { ;hdddirbuf
hddencbuf = hdddirbuf + $200
!if (hddencbuf + $200) > $c000 {
!if hddencbuf < $d000 {
!set hddencbuf = reloc - $200
} ;hddencbuf
} ;hddencbuf
} ;hdddirbuf
} ;fast_subindex
} ;aligned_read = 0 or rwts_mode = 1
!if allow_trees = 1 {
!if fast_trees = 1 {
!if ((aligned_read xor 1) + rwts_mode) > 0 {
!if hddencbuf < reloc {
hddtreebuf = hddencbuf - $200
} else { ;hddencbuf
hddtreebuf = hddencbuf + $200
!if (hddtreebuf + $200) > $c000 {
!if hddtreebuf < $d000 {
!set hddtreebuf = reloc - $200
} ;hddtreebuf
} ;hddtreebuf
} ;hddencbuf
} else { ;aligned_read = 1
!if hdddirbuf < reloc {
hddtreebuf = hdddirbuf - $200
} else { ;hdddirbuf
hddtreebuf = hdddirbuf + $200
!if (hddtreebuf + $200) > $c000 {
!if hddtreebuf < $d000 {
!set hddtreebuf = reloc - $200
} ;hddtreebuf
} ;hddtreebuf
} ;hdddirbuf
} ;aligned_read
} else { ;fast_trees = 0
hddtreebuf = hdddirbuf
} ;fast_trees
} ;allow_trees
} ;load_high
} else { ;reloc > $c000
!if ((hdddataend + $ff) & -256) != 0 {
!if ((hdddataend + $ff) & -256) < reloc {
!serious "initial reloc too high, adjust to ", (0 - (((hdddataend + $ff) & -256) - reloc)) & $ffff
} ;hdddataend
} ;hdddataend
!if load_high = 1 {
!if enable_floppy = 0 {
!if (((hdddataend + $ff) & -256) & $ffff) != 0 {
!warn "initial reloc too low, adjust to ", (0 - (((hdddataend + $ff) & -256) - reloc)) & $ffff
} ;hdddataend
} ;enable_floppy
hdddirbuf = reloc - $200
!if aligned_read = 0 {
hddencbuf = hdddirbuf - $200
} ;aligned_read
!if allow_trees = 1 {
!if fast_trees = 1 {
!if ((aligned_read xor 1) + enable_write) > 0 {
hddtreebuf = hddencbuf - $200
} else { ;aligned_read = 1 and enable_write = 0
hddtreebuf = hdddirbuf - $200
} ;aligned_read = 0 or enable_write = 1
} else { ;fast_trees = 0
hddtreebuf = hdddirbuf
} ;fast_trees
} ;allow_trees
} else { ;load_high = 0
!pseudopc ((hdddataend + $ff) & -256) {
hdddirbuf = $d200
}
!if aligned_read = 0 {
hddencbuf = hdddirbuf - $200
} ;aligned_read
!if allow_trees = 1 {
!if fast_trees = 1 {
!if ((aligned_read xor 1) + enable_write) > 0 {
hddtreebuf = hddencbuf + $200
} else { ;aligned_read = 1 and enable_write = 0
hddtreebuf = hdddirbuf + $200
} ;aligned_read = 0 or enable_write = 1
} else { ;fast_trees = 0
hddtreebuf = hdddirbuf
} ;fast_trees
} ;allow_trees
} ;load_high
} ;reloc
!if verbose_info = 1 {
!warn "hdd code: ", reloc, "-", hddcodeend - 1
!if hddcodeend != hdddataend {
!warn "hdd data: ", hddcodeend, "-", hdddataend - 1
}
!warn "hdd dirbuf: ", hdddirbuf, "-", hdddirbuf + $1ff
!if ((aligned_read xor 1) + rwts_mode) > 0 {
!warn "hdd encbuf: ", hddencbuf, "-", hddencbuf + $1ff
} ;aligned_read = 0 or rwts_mode = 1
!if allow_trees = 1 {
!warn "hdd treebuf: ", hddtreebuf, "-", hddtreebuf + $1ff
} ;allow_trees
!warn "hdd driver start: ", unrelochdd - init
!if (one_page + enable_floppy) = 0 {
!if ((hddcodeend - reloc) < $100) {
!warn "one_page can be enabled, code is small enough"
} ;hddcodeend
} ;not one_page and not enable_floppy
} ;verbose_info
} ;PASS2
readbuff = $800
!byte $D3,$C1,$CE,$A0,$C9,$CE,$C3,$AE
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