mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-01-14 13:33:48 +00:00
ootw: add loader that allows choosing what to run
This commit is contained in:
Vince Weaver
parent
3710d954a7
commit
642fb04b36
@ -6,8 +6,9 @@ PNG2RLE = ../gr-utils/png2rle
|
||||
|
||||
all: ootw.dsk
|
||||
|
||||
ootw.dsk: HELLO OOTW INTRO
|
||||
ootw.dsk: HELLO LOADER OOTW INTRO
|
||||
$(DOS33) -y ootw.dsk SAVE A HELLO
|
||||
$(DOS33) -y ootw.dsk BSAVE -a 0x1800 LOADER
|
||||
$(DOS33) -y ootw.dsk BSAVE -a 0x2000 OOTW
|
||||
$(DOS33) -y ootw.dsk BSAVE -a 0x2000 INTRO
|
||||
|
||||
@ -28,6 +29,7 @@ ootw.o: ootw.s \
|
||||
sprites_physicist.inc sprites_slugs.inc \
|
||||
sprites_ootw.inc sprites_beast.inc
|
||||
ca65 -o ootw.o ootw.s -l ootw.lst
|
||||
|
||||
####
|
||||
|
||||
INTRO: intro.o
|
||||
@ -41,6 +43,15 @@ intro.o: intro.s \
|
||||
intro_open_soda.inc intro_drinking.inc intro_collider_ui.inc \
|
||||
intro_tunnel1.inc intro_tunnel2.inc intro_gone.inc
|
||||
ca65 -o intro.o intro.s -l intro.lst
|
||||
|
||||
####
|
||||
|
||||
LOADER: loader.o
|
||||
ld65 -o LOADER loader.o -C ../linker_scripts/apple2_1800.inc
|
||||
|
||||
loader.o: loader.s
|
||||
ca65 -o loader.o loader.s -l loader.lst
|
||||
|
||||
####
|
||||
|
||||
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
5 HOME
|
||||
10 PRINT "OOTW PROOF-OF-CONCEPT V1.3 BY DEATER"
|
||||
10 PRINT "OOTW PROOF-OF-CONCEPT V1.4 BY DEATER"
|
||||
20 PRINT
|
||||
25 PRINT " ,"
|
||||
30 PRINT "ORIGINAL BY ERIC CHAHI"
|
||||
@ -12,4 +12,11 @@
|
||||
90 HTAB 10:PRINT "A \/\/\/ PRODUCTION"
|
||||
92 PRINT
|
||||
95 HTAB 12:PRINT "APPLE ][ FOREVER"
|
||||
100 PRINT CHR$ (4)"BRUN OOTW"
|
||||
100 PRINT:PRINT "WHAT DO YOU WANT TO DO?"
|
||||
110 PRINT "1). START WITH INTRO MOVIE"
|
||||
120 PRINT "2). START AT CHECKPOINT 1 (IH8S)"
|
||||
130 PRINT "3). START AT CHECKPOINT 2 (RAGE)"
|
||||
140 INPUT A
|
||||
150 IF A < 1 OR A > 3 THEN 5
|
||||
160 POKE 5,(A-1)
|
||||
200 PRINT CHR$ (4)"BRUN LOADER"
|
||||
|
||||
773
ootw/loader.s
Normal file
773
ootw/loader.s
Normal file
@ -0,0 +1,773 @@
|
||||
; Loader for OOTW
|
||||
|
||||
; the BASIC program sets $05 with which thing to load
|
||||
|
||||
|
||||
|
||||
|
||||
; read any file slot 6 version
|
||||
; based on FASTLD6 and RTS copyright (c) Peter Ferrie 2011-2013,2018
|
||||
|
||||
; modified to assembled with ca64 -- vmw
|
||||
; added code to patch it to run from current disk slot -- vmw
|
||||
|
||||
|
||||
WHICH_LOAD = $05 ; 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
|
||||
TEMPY = $fa
|
||||
namlo = $fb
|
||||
namhi = $fc
|
||||
step = $fd ; state for stepper motor
|
||||
tmptrk = $fe ; temporary copy of current track
|
||||
phase = $ff ; current phase for /seek
|
||||
|
||||
dirbuf = $1d00
|
||||
;$1e00 ; note, don't put this immediately below
|
||||
; the value being read as destaddr-4
|
||||
; is temporarily overwritten during read
|
||||
; process
|
||||
|
||||
|
||||
; note also, can't load file bigger than $8000 (32k) in size?
|
||||
; seems to break things?
|
||||
|
||||
start:
|
||||
jsr init ; unhook DOS, init nibble table
|
||||
|
||||
;======================
|
||||
|
||||
which_load_loop:
|
||||
|
||||
lda WHICH_LOAD
|
||||
cmp #1
|
||||
beq load_ootw_cp1
|
||||
cmp #2
|
||||
beq load_ootw_cp2
|
||||
|
||||
; fall through
|
||||
|
||||
load_intro:
|
||||
|
||||
; open and read a file
|
||||
lda #<intro_filename
|
||||
sta namlo
|
||||
lda #>intro_filename
|
||||
sta namhi
|
||||
jmp load_done
|
||||
|
||||
load_ootw_cp1:
|
||||
|
||||
; open and read a file
|
||||
lda #<ootw_filename
|
||||
sta namlo
|
||||
lda #>ootw_filename
|
||||
sta namhi
|
||||
jmp load_done
|
||||
|
||||
load_ootw_cp2:
|
||||
|
||||
; open and read a file
|
||||
lda #<ootw_c2_filename
|
||||
sta namlo
|
||||
lda #>ootw_c2_filename
|
||||
sta namhi
|
||||
jmp load_done
|
||||
|
||||
|
||||
load_done:
|
||||
|
||||
jsr opendir ; open and read entire file into memory
|
||||
|
||||
jsr $2000 ; jump to common entry point
|
||||
|
||||
; hope they updated the WHICH_LOAD value
|
||||
|
||||
jmp which_load_loop
|
||||
|
||||
; filename to open is 30-character Apple text:
|
||||
intro_filename: ;.byte "INTRO "
|
||||
.byte 'I'|$80,'N'|$80,'T'|$80,'R'|$80,'O'|$80,$A0,$A0,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0
|
||||
|
||||
ootw_filename: ;.byte "OOTW "
|
||||
.byte 'O'|$80,'O'|$80,'T'|$80,'W'|$80,$A0,$A0,$A0,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0
|
||||
|
||||
ootw_c2_filename: ;.byte "OOTW_C2 "
|
||||
.byte 'O'|$80,'O'|$80,'T'|$80,'W'|$80,'_'|$80,'C'|$80,'w'|$80,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0
|
||||
.byte $A0,$A0,$A0,$A0,$A0,$A0
|
||||
|
||||
|
||||
;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
|
||||
|
||||
; 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
|
||||
|
||||
;===========================
|
||||
; opendir
|
||||
;===========================
|
||||
|
||||
; 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 entry_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 adrhi
|
||||
; 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
|
||||
|
||||
|
||||
.if 0
|
||||
;==============================
|
||||
; old code
|
||||
|
||||
|
||||
; [re-]read sector
|
||||
|
||||
re_read_addr:
|
||||
jsr readadr
|
||||
|
||||
repeat_until_right_sector:
|
||||
cmp reqsec
|
||||
bne re_read_addr
|
||||
|
||||
;==========================
|
||||
; read sector data
|
||||
;==========================
|
||||
;
|
||||
|
||||
readdata:
|
||||
mlsmc07:
|
||||
ldy $c0ec ; read data until valid
|
||||
bpl readdata
|
||||
find_D5:
|
||||
cpy #$d5 ; if not D5, repeat
|
||||
bne readdata
|
||||
find_AA:
|
||||
mlsmc08:
|
||||
ldy $c0ec ; read data until valid, should be AA
|
||||
bpl find_AA
|
||||
cpy #$aa ; we need Y=#$AA later
|
||||
bne find_D5
|
||||
find_AD:
|
||||
mlsmc09:lda $c0ec ; read data until high bit set (valid)
|
||||
bpl find_AD
|
||||
eor #$ad ; should match $ad
|
||||
bne * ; lock if didn't find $ad (failure)
|
||||
L12:
|
||||
mlsmc0A:ldx $c0ec ; read data until high bit set (valid)
|
||||
bpl L12
|
||||
eor nibtbl-$80, x
|
||||
sta bit2tbl-$aa, y
|
||||
iny
|
||||
bne L12
|
||||
L13:
|
||||
mlsmc0B:ldx $c0ec ; read data until high bit set (valid)
|
||||
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
|
||||
|
||||
;=================
|
||||
; readadr -- read address field
|
||||
;=================
|
||||
; Find address field, put track in cutrk, sector in tmpsec
|
||||
readadr:
|
||||
mlsmc0C:lda $c0ec ; read data until we find a $D5
|
||||
bpl readadr
|
||||
adr_d5:
|
||||
cmp #$d5
|
||||
bne readadr
|
||||
|
||||
adr_aa:
|
||||
mlsmc0D:lda $c0ec ; read data until we find a $AA
|
||||
bpl adr_aa
|
||||
cmp #$aa
|
||||
bne adr_d5
|
||||
|
||||
adr_96:
|
||||
mlsmc0E:lda $c0ec ; read data until we find a $96
|
||||
bpl adr_96
|
||||
cmp #$96
|
||||
bne adr_d5
|
||||
|
||||
ldy #3 ; three?
|
||||
; first read volume/volume
|
||||
; then track/track
|
||||
; then sector/sector?
|
||||
adr_read_two_bytes:
|
||||
sta curtrk ; store out current track
|
||||
tax
|
||||
L20:
|
||||
mlsmc0F:lda $c0ec ; read until full value
|
||||
bpl L20
|
||||
rol
|
||||
sta tmpsec
|
||||
L21:
|
||||
mlsmc10:lda $c0ec ; read until full value
|
||||
bpl L21 ; sector value is (v1<<1)&v2????
|
||||
and tmpsec
|
||||
dey ; loop 3 times
|
||||
bne adr_read_two_bytes
|
||||
|
||||
seekret:
|
||||
rts ; return
|
||||
|
||||
;================
|
||||
; SEEK
|
||||
;================
|
||||
; current track in curtrk
|
||||
; desired track in phase
|
||||
|
||||
seek:
|
||||
asl curtrk ; multiply by 2
|
||||
asl phase ; multiply by 2
|
||||
lda #0
|
||||
sta step
|
||||
copy_cur:
|
||||
lda curtrk ; load current track
|
||||
sta tmptrk ; store as temptrk
|
||||
sec ; calc current-desired
|
||||
sbc phase
|
||||
beq seekret ; if they match, we are done!
|
||||
|
||||
bcs seek_neg ; if negative, skip ahead
|
||||
eor #$ff ; ones-complement the distance
|
||||
inc curtrk ; increment current (make it 2s comp?)
|
||||
bcc L114 ; skip ahead
|
||||
seek_neg:
|
||||
adc #$fe
|
||||
dec curtrk
|
||||
L114:
|
||||
cmp step
|
||||
bcc L115
|
||||
lda step
|
||||
L115:
|
||||
cmp #8
|
||||
bcs L116
|
||||
tay
|
||||
sec
|
||||
L116:
|
||||
lda curtrk
|
||||
ldx step1, y
|
||||
bne L118
|
||||
L117:
|
||||
clc
|
||||
lda tmptrk
|
||||
ldx step2, y
|
||||
L118:
|
||||
stx tmpsec
|
||||
and #3
|
||||
rol
|
||||
tax
|
||||
mlsmc11:sta $c0e0, x
|
||||
L119:
|
||||
ldx #$13
|
||||
L120:
|
||||
dex
|
||||
bne L120
|
||||
dec tmpsec
|
||||
bne L119
|
||||
lsr
|
||||
bcs L117
|
||||
inc step
|
||||
bne copy_cur
|
||||
.endif
|
||||
|
||||
|
||||
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
|
||||
|
||||
@ -5,6 +5,7 @@
|
||||
LZ4_SRC = $00
|
||||
LZ4_DST = $02
|
||||
LZ4_END = $04
|
||||
WHICH_LOAD = $05
|
||||
COUNT = $06
|
||||
DELTA = $08
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user