;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 # 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 # 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 + 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 + 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 + 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 #unrelochdd ldy #((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 ldy # 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