mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-01 01:06:33 +00:00
773 lines
13 KiB
ArmAsm
773 lines
13 KiB
ArmAsm
; Loader for MIST
|
|
|
|
|
|
.include "zp.inc"
|
|
.include "hardware.inc"
|
|
|
|
.include "common_defines.inc"
|
|
|
|
nibtbl = $300 ; nothing uses the bottom 128 bytes of $300, do they?
|
|
bit2tbl = $380 ; bit2tbl: .res 86 ; = nibtbl+128
|
|
filbuf = $3D6 ; filbuf: .res 4 ; = bit2tbl+86
|
|
|
|
; read any file slot 6 version
|
|
; based on FASTLD6 and RTS copyright (c) Peter Ferrie 2011-2013,2018
|
|
|
|
; modified to assembled with ca65 -- vmw
|
|
; added code to patch it to run from current disk slot -- vmw
|
|
|
|
; WHICH_LOAD = $7E ; thing to load
|
|
; adrlo = $26 ; constant from boot prom
|
|
; adrhi = $27 ; constant from boot prom
|
|
; tmpsec = $3c ; constant from boot prom
|
|
; reqsec = $3d ; constant from boot prom
|
|
; sizelo = $44
|
|
; sizehi = $45
|
|
; secsize = $46
|
|
; namlo = $f8
|
|
; namhi = $f9
|
|
; TEMPY = $fa
|
|
; step = $fd ; state for stepper motor
|
|
; tmptrk = $fe ; temporary copy of current track
|
|
; phase = $ff ; current phase for /seek
|
|
; OUTL = $fe ; for picking filename
|
|
; OUTH = $ff
|
|
|
|
dirbuf = $c00
|
|
; note, don't put this immediately below
|
|
; the value being read as destaddr-4
|
|
; is temporarily overwritten during read
|
|
; process
|
|
|
|
|
|
FILENAME = $280
|
|
|
|
;===================================================
|
|
;===================================================
|
|
; START / INIT
|
|
;===================================================
|
|
;===================================================
|
|
|
|
loader_start:
|
|
|
|
lda #LOAD_TITLE
|
|
sta WHICH_LOAD
|
|
|
|
jsr init ; unhook DOS, init nibble table
|
|
|
|
|
|
;===================================================
|
|
;===================================================
|
|
; SETUP THE FILENAME
|
|
;===================================================
|
|
;===================================================
|
|
|
|
which_load_loop:
|
|
lda WHICH_LOAD
|
|
|
|
; update the which-file error message
|
|
tay
|
|
lda which_disk,Y
|
|
sta error_string+19
|
|
|
|
lda WHICH_LOAD
|
|
asl
|
|
|
|
tay
|
|
lda filenames,Y
|
|
sta OUTL
|
|
lda filenames+1,Y
|
|
sta OUTH
|
|
|
|
lda WHICH_LOAD
|
|
bne load_other
|
|
|
|
load_intro:
|
|
lda #<$4000
|
|
sta entry_smc+1
|
|
lda #>$4000
|
|
sta entry_smc+2
|
|
jmp actual_load
|
|
|
|
load_other:
|
|
lda #<$2000
|
|
sta entry_smc+1
|
|
lda #>$2000
|
|
sta entry_smc+2
|
|
|
|
actual_load:
|
|
|
|
;===================================================
|
|
;===================================================
|
|
; SET UP DOS3.3 FILENAME
|
|
;===================================================
|
|
;===================================================
|
|
|
|
load_file_and_execute:
|
|
|
|
jsr opendir_filename
|
|
|
|
entry_smc:
|
|
jsr $1000 ; jump to common entry point
|
|
|
|
; hope they updated the WHICH_LOAD value
|
|
|
|
jmp which_load_loop
|
|
|
|
|
|
;==============================
|
|
; setup filename then open/load
|
|
|
|
opendir_filename:
|
|
|
|
; clear out the filename with $A0 (space)
|
|
|
|
lda #<FILENAME
|
|
sta namlo
|
|
lda #>FILENAME
|
|
sta namhi
|
|
|
|
ldy #29
|
|
wipe_filename_loop:
|
|
lda #$A0
|
|
sta (namlo),Y
|
|
dey
|
|
bpl wipe_filename_loop
|
|
|
|
ldy #0
|
|
copy_filename_loop:
|
|
lda (OUTL),Y
|
|
beq copy_filename_done
|
|
ora #$80
|
|
sta (namlo),Y
|
|
iny
|
|
bne copy_filename_loop
|
|
|
|
copy_filename_done:
|
|
jsr opendir ; open and read entire file into memory
|
|
|
|
rts
|
|
|
|
filenames:
|
|
.word intro_filename
|
|
.word mist_filename,meche_filename,selena_filename,octagon_filename
|
|
.word viewer_filename,stoney_filename,channel_filename,cabin_filename
|
|
.word dentist_filename,arbor_filename,nibel_filename,ship_filename
|
|
.word generator_filename,dni_filename,sub_filename
|
|
|
|
which_disk:
|
|
.byte '1' ; MIST_TITLE
|
|
.byte '1' ; MIST
|
|
.byte '3' ; MECHE
|
|
.byte '3' ; SELENA
|
|
.byte '1' ; OCTAGON
|
|
.byte '1' ; VIEWER
|
|
.byte '3' ; STONEY
|
|
.byte '2' ; CHANNEL
|
|
.byte '2' ; CABIN
|
|
.byte '1' ; DENTIST
|
|
.byte '2' ; ARBOR
|
|
.byte '2' ; NIBEL
|
|
.byte '1' ; SHIP
|
|
.byte '2' ; GENERATOR
|
|
.byte '1' ; D'NI
|
|
.byte '3' ; SUB
|
|
|
|
intro_filename:
|
|
.byte "MIST_TITLE",0
|
|
mist_filename:
|
|
.byte "MIST",0
|
|
meche_filename:
|
|
.byte "MECHE",0
|
|
selena_filename:
|
|
.byte "SELENA",0
|
|
octagon_filename:
|
|
.byte "OCTAGON",0
|
|
viewer_filename:
|
|
.byte "VIEWER",0
|
|
stoney_filename:
|
|
.byte "STONEY",0
|
|
channel_filename:
|
|
.byte "CHANNEL",0
|
|
cabin_filename:
|
|
.byte "CABIN",0
|
|
dentist_filename:
|
|
.byte "DENTIST",0
|
|
arbor_filename:
|
|
.byte "ARBOR",0
|
|
nibel_filename:
|
|
.byte "NIBEL",0
|
|
ship_filename:
|
|
.byte "SHIP",0
|
|
generator_filename:
|
|
.byte "GENERATOR",0
|
|
dni_filename:
|
|
.byte "D'NI",0
|
|
sub_filename:
|
|
.byte "SUB",0
|
|
|
|
|
|
;===================================================
|
|
;===================================================
|
|
; INIT (build nibble table)
|
|
;===================================================
|
|
;===================================================
|
|
|
|
;unhook DOS and build nibble table
|
|
|
|
init:
|
|
; patch to use current drive
|
|
|
|
; locate input paramater list
|
|
jsr $3E3
|
|
; result is in A:Y
|
|
sta $FF
|
|
sty $FE
|
|
ldy #1
|
|
lda ($FE),y
|
|
|
|
; list+1 should have slot<<8
|
|
|
|
|
|
ora #$80 ; add in $80
|
|
|
|
; c0e0
|
|
sta mlsmc06+1
|
|
|
|
; c0e8
|
|
clc
|
|
adc #8
|
|
sta mlsmc02+1
|
|
sta mlsmc07+1
|
|
|
|
; c0e9
|
|
clc
|
|
adc #1
|
|
sta mlsmc01+1
|
|
|
|
; c0ec
|
|
clc
|
|
adc #3
|
|
sta mlsmc03+1
|
|
sta mlsmc04+1
|
|
sta mlsmc05+1
|
|
|
|
jsr $fe93 ; clear COUT
|
|
jsr $fe89 ; clear KEYIN
|
|
|
|
;========================
|
|
; Create nibble table
|
|
; Note: the table starts 16 bytes in, and is sparse
|
|
; so it doesn't entirely look like the DOS33 table at
|
|
|
|
ldy #0
|
|
ldx #3
|
|
L1: stx $3c ; store tempx (3?)
|
|
txa ; a=x (a=3)
|
|
asl ; a*=2 (a=6)
|
|
bit $3c ; a&tempx, set N/V (a=6)
|
|
beq L3 ; if 0, skip to L3
|
|
ora $3c ; a|=tempx (a=7)
|
|
eor #$ff ; a=~a (a=f8)
|
|
and #$7e ; a&=0x7e 0111 1110 (a=78)
|
|
L2: bcs L3 ; this set way back at asl??
|
|
lsr ; a>>1 a=3c c=0
|
|
; a=1e c=0
|
|
; a=0f c=0
|
|
; a=07 c=1
|
|
bne L2 ; if a!=0 goto l2
|
|
tya ; if a==0, a=y
|
|
sta nibtbl, x ; write out to table
|
|
iny ; increment y
|
|
L3: inx ; increment x x=4, a=0f
|
|
bpl L1 ; loop while high bit not set
|
|
|
|
rts
|
|
|
|
|
|
;===================================================
|
|
;===================================================
|
|
; file not found
|
|
;===================================================
|
|
;===================================================
|
|
|
|
file_not_found:
|
|
|
|
mlsmc07:lda $c0e8 ; turn off drive motor?
|
|
|
|
jsr TEXT
|
|
jsr HOME
|
|
|
|
ldy #0
|
|
|
|
lda #<error_string
|
|
sta OUTL
|
|
lda #>error_string
|
|
sta OUTH
|
|
|
|
quick_print:
|
|
lda (OUTL),Y
|
|
beq quick_print_done
|
|
jsr COUT1
|
|
iny
|
|
jmp quick_print
|
|
|
|
quick_print_done:
|
|
; rts
|
|
|
|
; jsr quick_print
|
|
|
|
fnf_keypress:
|
|
lda KEYPRESS
|
|
bpl fnf_keypress
|
|
bit KEYRESET
|
|
|
|
jmp which_load_loop
|
|
|
|
; offset for disk number is 19
|
|
error_string:
|
|
.byte "PLEASE INSERT DISK 1, PRESS RETURN",0
|
|
|
|
|
|
|
|
|
|
|
|
;===================================================
|
|
;===================================================
|
|
; OPENDIR: actually load the file
|
|
;===================================================
|
|
;===================================================
|
|
|
|
; turn on drive and read volume table of contents
|
|
opendir:
|
|
mlsmc01:lda $c0e9 ; turn slot#6 drive on
|
|
ldx #0
|
|
stx adrlo ; zero out adrlo
|
|
stx secsize ; zero out secsize
|
|
lda #$11 ; a=$11 (VTOC)
|
|
jsr readdirsec
|
|
firstent:
|
|
|
|
lda dirbuf+1
|
|
|
|
; lock if entry not found
|
|
entry_not_found:
|
|
beq file_not_found
|
|
|
|
; read directory sector
|
|
|
|
ldx dirbuf+2
|
|
jsr seekread1
|
|
ldy #7 ;number of directory entries in a sector
|
|
ldx #$2b ;offset of filename in directory entry
|
|
nextent:
|
|
tya
|
|
pha ; was **phy**
|
|
txa
|
|
pha ; was **phx**
|
|
ldy #$1d
|
|
|
|
; match name backwards (slower but smaller)
|
|
|
|
L4:
|
|
lda (namlo), y
|
|
cmp dirbuf, x
|
|
beq foundname
|
|
pla
|
|
|
|
; move to next directory in this block, if possible
|
|
|
|
clc
|
|
adc #$23
|
|
tax
|
|
pla
|
|
tay ; was **ply**
|
|
dey
|
|
bne nextent
|
|
beq firstent ; was **bra**
|
|
|
|
foundname:
|
|
dex
|
|
dey
|
|
bpl L4
|
|
pla
|
|
tay ; was **ply**
|
|
pla
|
|
|
|
; read track/sector list
|
|
|
|
lda dirbuf-32, y
|
|
ldx dirbuf-31, y
|
|
jsr seekread1
|
|
|
|
; read load offset and length info only, initially
|
|
|
|
lda #<filbuf
|
|
sta adrlo
|
|
lda #4
|
|
sta secsize
|
|
lda dirbuf+12
|
|
ldx dirbuf+13
|
|
ldy #>filbuf
|
|
jsr seekread
|
|
|
|
; reduce load offset by 4, to account for offset and length
|
|
|
|
sec
|
|
lda filbuf
|
|
sbc #4
|
|
sta adrlo
|
|
|
|
lda filbuf+1
|
|
sbc #0
|
|
sta adrhi
|
|
|
|
; save on stack bytes that will be overwritten by extra read
|
|
|
|
ldy #3
|
|
L5:
|
|
lda (adrlo), y
|
|
pha
|
|
dey
|
|
bpl L5
|
|
|
|
lda adrhi
|
|
pha
|
|
lda adrlo
|
|
pha
|
|
|
|
; increase load size by 4, to account for offst and length
|
|
|
|
lda filbuf+2
|
|
adc #3
|
|
sta sizelo
|
|
sta secsize
|
|
|
|
lda filbuf+3
|
|
adc #0
|
|
sta sizehi
|
|
beq readfirst
|
|
lda #0 ; was **stz secsize**
|
|
sta secsize
|
|
|
|
readfirst:
|
|
ldy #$0c
|
|
|
|
; read a file sector
|
|
|
|
readnext:
|
|
tya
|
|
pha
|
|
lda dirbuf, y ; A = track
|
|
ldx dirbuf+1, y ; x = sector
|
|
jsr seekread1
|
|
pla
|
|
tay
|
|
|
|
; if low count is non-zero then we are done
|
|
; (can happen only for partial last block)
|
|
|
|
lda secsize
|
|
bne readdone
|
|
|
|
; continue if more than $100 bytes left
|
|
|
|
dec sizehi
|
|
bne L6
|
|
|
|
; set read size to min(length, $100)
|
|
|
|
lda sizelo
|
|
beq readdone
|
|
sta secsize
|
|
L6:
|
|
inc adrhi
|
|
iny
|
|
iny
|
|
bne readnext
|
|
|
|
; save current address for after t/s read
|
|
|
|
lda adrhi
|
|
pha
|
|
lda adrlo
|
|
pha
|
|
lda #0
|
|
sta adrlo ; was **stz adrlo**
|
|
|
|
; read next track/sector sector
|
|
|
|
lda dirbuf+1
|
|
ldx dirbuf+2
|
|
jsr readdirsec
|
|
clc
|
|
|
|
; restore current address
|
|
readdone:
|
|
pla
|
|
sta adrlo ; code originally had this backwards
|
|
pla
|
|
sta adrhi
|
|
bcc readfirst
|
|
|
|
mlsmc02:lda $c0e8
|
|
|
|
; restore from stack bytes that were overwritten by extra read
|
|
|
|
ldx #3
|
|
ldy #0
|
|
L7:
|
|
pla
|
|
sta (adrlo), y
|
|
iny
|
|
dex
|
|
bpl L7
|
|
rts
|
|
|
|
|
|
;======================
|
|
; readdirsec
|
|
;======================
|
|
; a = track?
|
|
; x = sector?
|
|
readdirsec:
|
|
ldy #>dirbuf
|
|
seekread:
|
|
sty adrhi
|
|
seekread1:
|
|
sta phase
|
|
lda sectbl, x
|
|
sta reqsec
|
|
jsr readadr
|
|
|
|
; if track does not match, then seek
|
|
|
|
cpx phase
|
|
beq checksec
|
|
jsr seek
|
|
|
|
|
|
;=========================================
|
|
; re merge in with qkumba's recent changes
|
|
; to fix seek problem?
|
|
;=========================================
|
|
|
|
; [re-]read sector
|
|
|
|
re_read_addr:
|
|
jsr readadr
|
|
checksec:
|
|
cmp reqsec
|
|
bne re_read_addr
|
|
|
|
;=========================
|
|
; read sector data
|
|
;=========================
|
|
|
|
readdata:
|
|
jsr readd5aa
|
|
eor #$ad ; zero A if match
|
|
bne re_read_addr
|
|
|
|
L12:
|
|
mlsmc03:ldx $c0ec ; read until valid data (high bit set)
|
|
bpl L12
|
|
eor nibtbl-$80, x
|
|
sta bit2tbl-$aa, y
|
|
iny
|
|
bne L12
|
|
L13:
|
|
mlsmc04:ldx $c0ec ; read until valid data (high bit set)
|
|
bpl L13
|
|
eor nibtbl-$80, x
|
|
sta (adrlo), y ; the real address
|
|
iny
|
|
cpy secsize
|
|
bne L13
|
|
ldy #0
|
|
L14:
|
|
ldx #$a9
|
|
L15:
|
|
inx
|
|
beq L14
|
|
lda (adrlo), y
|
|
lsr bit2tbl-$aa, x
|
|
rol
|
|
lsr bit2tbl-$aa, x
|
|
rol
|
|
sta (adrlo), y
|
|
iny
|
|
cpy secsize
|
|
bne L15
|
|
rts
|
|
|
|
; no tricks here, just the regular stuff
|
|
|
|
;=======================
|
|
; readaddr -- read the address field
|
|
;=======================
|
|
; Find address field, put track in cutrk, sector in tmpsec
|
|
|
|
readadr:
|
|
jsr readd5aa
|
|
cmp #$96
|
|
bne readadr
|
|
ldy #3 ; three?
|
|
; first read volume/volume
|
|
; then track/track
|
|
; then sector/sector?
|
|
adr_read_two_bytes:
|
|
tax
|
|
jsr readnib
|
|
rol
|
|
sta tmpsec
|
|
jsr readnib
|
|
and tmpsec
|
|
dey
|
|
bne adr_read_two_bytes
|
|
rts
|
|
|
|
;========================
|
|
; make sure we see the $D5 $AA pattern
|
|
|
|
readd5aa:
|
|
L16:
|
|
jsr readnib
|
|
L17:
|
|
cmp #$d5
|
|
bne L16
|
|
jsr readnib
|
|
cmp #$aa
|
|
bne L17
|
|
tay ; we need Y=#$AA later
|
|
|
|
readnib:
|
|
mlsmc05:lda $c0ec ; read until valid (high bit set)
|
|
bpl readnib
|
|
|
|
seekret:
|
|
rts
|
|
|
|
;=====================
|
|
; SEEK
|
|
;=====================
|
|
; current track in X?
|
|
; desired track in phase
|
|
|
|
seek:
|
|
ldy #0
|
|
sty step
|
|
asl phase ; multiply by two
|
|
txa ; current track?
|
|
asl ; mul by two
|
|
copy_cur:
|
|
tax
|
|
sta tmptrk
|
|
sec
|
|
sbc phase
|
|
beq L22
|
|
bcs L18
|
|
eor #$ff
|
|
inx
|
|
bcc L19
|
|
L18:
|
|
sbc #1
|
|
dex
|
|
L19:
|
|
cmp step
|
|
bcc L20
|
|
lda step
|
|
L20:
|
|
cmp #8
|
|
bcs L21
|
|
tay
|
|
sec
|
|
L21:
|
|
txa
|
|
pha
|
|
ldx step1, y
|
|
L22:
|
|
php
|
|
bne L24
|
|
L23:
|
|
clc
|
|
lda tmptrk
|
|
ldx step2, y
|
|
L24:
|
|
stx tmpsec
|
|
and #3
|
|
rol
|
|
tax
|
|
lsr
|
|
mlsmc06:lda $c0e0, x
|
|
L25:
|
|
ldx #$12
|
|
L26:
|
|
dex
|
|
bpl L26
|
|
dec tmpsec
|
|
bne L25
|
|
bcs L23
|
|
plp
|
|
beq seekret
|
|
pla
|
|
inc step
|
|
bne copy_cur
|
|
|
|
|
|
|
|
step1: .byte $01, $30, $28, $24, $20, $1e, $1d, $1c
|
|
step2: .byte $70, $2c, $26, $22, $1f, $1e, $1d, $1c
|
|
|
|
sectbl: .byte $00,$0d,$0b,$09,$07,$05,$03,$01,$0e,$0c,$0a,$08,$06,$04,$02,$0f
|
|
|
|
|
|
; From $BA96 of DOS33
|
|
;nibtbl: .res 128 ; = *
|
|
; .byte $00,$01,$98,$99,$02,$03,$9C,$04 ; $BA96 ; 00
|
|
; .byte $05,$06,$A0,$A1,$A2,$A4,$A4,$A5 ; $BA9E ; 08
|
|
; .byte $07,$08,$A8,$A9,$AA,$09,$0A,$0B ; $BAA6 ; 10
|
|
; .byte $0C,$0D,$B0,$B1,$0E,$0F,$10,$11 ; $BAAE ; 18
|
|
; .byte $12,$13,$B8,$14,$15,$16,$17,$18 ; $BAB6 ; 20
|
|
; .byte $19,$1A,$C0,$C1,$C2,$C3,$C4,$C5 ; $BABE ; 28
|
|
; .byte $C6,$C7,$C8,$C9,$CA,$1B,$CC,$1C ; $BAC6 ; 30
|
|
; .byte $1D,$1E,$D0,$D1,$D2,$1E,$D4,$D5 ; $BACE ; 38
|
|
; .byte $20,$21,$D8,$22,$23,$24,$25,$26 ; $BAD6 ; 40
|
|
; .byte $27,$28,$E0,$E1,$E2,$E3,$E4,$29 ; $BADE ; 48
|
|
; .byte $2A,$2B,$E8,$2C,$2D,$2E,$2F,$30 ; $BAE6 ; 50
|
|
; .byte $31,$32,$F0,$F1,$33,$34,$35,$36 ; $BAEE ; 58
|
|
; .byte $37,$38,$F8,$39,$3A,$3B,$3C,$3D ; $BAF6 ; 60
|
|
; .byte $3E,$3F,$13,$00,$01,$02,$01,$00 ; $BAFE ; 68
|
|
; .byte $00,$00,$00,$00,$00,$00,$00,$00
|
|
; .byte $00,$00,$00,$00,$00,$00,$00,$00
|
|
|
|
|
|
;bit2tbl: .res 86 ; = nibtbl+128
|
|
;filbuf: .res 4 ; = bit2tbl+86
|
|
;dataend = filbuf+4
|
|
|
|
.include "qkumba_popwr.s"
|
|
|
|
|
|
|
|
.include "audio.s"
|
|
.include "linking_noise.s"
|
|
.include "decompress_fast_v2.s"
|
|
.include "draw_pointer.s"
|
|
.include "end_level.s"
|
|
.include "gr_copy.s"
|
|
.include "gr_fast_clear.s"
|
|
.include "gr_offsets.s"
|
|
.include "gr_pageflip.s"
|
|
.include "gr_putsprite_crop.s"
|
|
.include "keyboard.s"
|
|
.include "text_print.s"
|
|
.include "loadstore.s"
|
|
|
|
.include "page_sprites.inc"
|
|
.include "common_sprites.inc"
|
|
|
|
loader_end:
|
|
|
|
.assert (<loader_end - <loader_start)>16, error, "loader too big"
|