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https://github.com/a2-4am/passport.git
synced 2024-06-16 04:29:32 +00:00
fix timing, free some memory
This commit is contained in:
Peter Ferrie
parent
22b2c8a867
commit
c309ea313e
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@ -48,7 +48,7 @@ flag = $FF ; byte
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RELBASE = $2000 ; dummy assignment for first build
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; to allow calculation of proper value
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}
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LOWPOINT = $4300 ; lowest available address for code
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LOWPOINT = $4000 ; lowest available address for code
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HIGHPOINT = $B200 ; highest available address+1 for code
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BASEPAGE = $10 ; Special Delivery tracer assumes
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; this is $10, so don't change it!
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32
src/memory.a
32
src/memory.a
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@ -7,12 +7,12 @@
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; 0A00..0AFF - backup of zero page during Special Delivery tracer, used by RAM disk
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; 0B00..0BFF - used by RAM disk
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; 0C00..0CFF - clobbered by Special Delivery tracer
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; 0D00..0FFF - unused
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; 0D00..0EFF - unused
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; 0F00..0FFF - backup of page $BF (SaveProDOS, SwapProDOS)
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; 1000..1FFF - data buffer for current track
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; 2000..35FF - clobbered by Special Delivery tracer
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; 3600..3FFF - clobbered by lomem DOS 3.3 / Special Delivery tracers
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; 4000..42FF - backup of zero page, page 3, page $BF (SaveProDOS, SwapProDOS)
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; 4300..B1FF - program code
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; 4000..B1FF - program code
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; B200..BFFF - clobbered by DOS boot tracer (RDOS is B200+, DOS 3.x is B600+)
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;-------------------------------
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@ -20,23 +20,15 @@
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;-------------------------------
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; SaveProDOS
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; saves memory pages used by ProDOS
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; pages $00, $03, $BF
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; pages $BF
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; in: none
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; out: all flags and registers clobbered
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;-------------------------------
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!zone {
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SaveProDOS
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lda #$00
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ldx #$40
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ldy #$01
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jsr CopyMemory
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lda #$03
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ldx #$41
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ldy #$01
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jsr CopyMemory
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SaveGlobal
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lda #$BF
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ldx #$42
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ldx #$0F
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ldy #$01
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;;jsr CopyMemory ; fall through
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}
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@ -118,23 +110,13 @@ ReorderBuffer
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;-------------------------------
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; SwapProDOS
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; saves/restores memory pages used by ProDOS
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; pages $00, $03, $BF
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; pages $BF
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; in: none
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; out: all flags and registers clobbered
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;-------------------------------
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SwapProDOS
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lda #$00
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ldx #$40
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ldy #$01
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sec
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jsr SwapMemory
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lda #$03
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ldx #$41
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ldy #$01
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sec
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jsr SwapMemory
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lda #$BF
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ldx #$42
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ldx #$0F
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ldy #$01
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sec
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;;jsr SwapMemory ; fall through
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@ -12,7 +12,8 @@ Choplifter
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bit gMode ; nothing to do here in verify-only mode
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bpl .exit
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;;prepare write routine at $2000-21ff first
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;; prepare write routine at $2000 for relocated address at $207
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;; the difficulty here is to find three spare pages across all games
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lda #$00
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sta gCommand
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@ -21,11 +22,6 @@ Choplifter
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jsr IncProgress
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.read
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lda KEY
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bpl .continue
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jmp .cancel
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.continue
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asl gTrack
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jsr ReadChoplifter
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lsr gTrack
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@ -98,10 +94,6 @@ Choplifter
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jsr .cleanup
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jmp Pass
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.cancel
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jsr .cleanup
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jmp Cancel
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.cleanup
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lda $C0E8
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lda #$01
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@ -140,20 +132,16 @@ ReadChoplifter
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.checkkey1
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lda KEY
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.linkcancel1
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bmi .cancel
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jsr .readnib
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- cmp #$DD
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bne .checkkey1
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jsr .readnib
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-- cmp #$F5
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cmp #$F5
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bne -
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jsr .readnib
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cmp #$D5
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bne -- ; this is the same bug
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nop ; timing bits
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nop ; timing bits
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nop ; timing bits
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bne - ; this had the same bug (see below)
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ldx #$03
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- jsr .read4x4
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jsr .read4x4
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@ -168,6 +156,10 @@ ReadChoplifter
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bcs .checktrack20
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rts
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.cancel
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jsr .cleanup
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jmp Cancel
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.settrack00
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lda #$D5
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sta cmp1+1
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@ -190,21 +182,19 @@ ReadChoplifter
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.checkkey0
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lda KEY
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.linkcancel2
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bmi .linkcancel1
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bmi .cancel
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jsr .readnib
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- cmp cmp2+1
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bne .checkkey0
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jsr .readnib
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-- cmp cmp2+0
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cmp cmp2+0
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bne -
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jsr .readnib
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cmp cmp1+1
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bne -- ; this is a bug
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; it allows PR0 PR1 [any] PR1 PR2 instead of requiring PR0 PR1 PR2
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nop ; timing bits
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nop ; timing bits
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nop ; timing bits
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ldy #0
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eor cmp1+1
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bne - ; this had a bug
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; it branched to the middle nibble instead of the first one
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; it allowed PR0 PR1 [any] PR1 PR2 instead of requiring PR0 PR1 PR2
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tay
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-- jsr .read4x4
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sta (modsrc), y
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iny
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@ -246,81 +236,75 @@ ReadChoplifter
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sta .prolog2+1
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lda (BASEPAGE<<8)+$D3
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sta .prolog3+1
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.checkkey2
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lda KEY
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.linkcancel3
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bmi .linkcancel2
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jsr .readnib
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-- jsr .readnib
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.prolog1
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- cmp #$D1 ; SMC
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bne .checkkey2
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bne --
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jsr .readnib
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.prolog2
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-- cmp #$D1 ; SMC
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cmp #$D1 ; SMC
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bne -
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jsr .readnib
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.prolog3
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cmp #$D1 ; SMC
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bne -- ; this is the same bug
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nop ; timing bits
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nop ; timing bits
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nop ; timing bits
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ldx #$00
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- jsr .read4x4
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eor #$D1 ; SMC
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bne - ; this had the same bug
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tax
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-- lda $C0EC ; timing issue requires unrolling part of this
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bpl --
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sec
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rol
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sta tmp
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jsr .readnib
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and tmp
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sta (BASEPAGE+$0f)<<8,x
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inx
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jsr .read4x4
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sta (BASEPAGE+$0f)<<8,x
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inx
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jsr .read4x4
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jsr .readnib
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sec
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rol
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sta tmp
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- lda $C0EC
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bpl -
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and tmp
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sta (BASEPAGE+$0f)<<8,x
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inx
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cmp #$EA
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bne -
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ldx #0
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.copywrite1
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lda $2000,x
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sta (BASEPAGE+8)<<8,x
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inx
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bne .copywrite1
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bne --
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;; future work, just disable for now
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;; ldx #0
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;;.copywrite
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;; lda .writeroutine,x
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;; sta (BASEPAGE+8)<<8,x
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;; inx
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;; bne .copywrite
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lda #$60 ; rts
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sta ((BASEPAGE+8)<<8)+7
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rts
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.readtrack22
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ldx #$40
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ldy #0
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.checkkey3
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dey
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-- dey
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bne +
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dex
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beq .copywrite2
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+ lda KEY
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bmi .linkcancel3
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jsr .readnib
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beq ++
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+ jsr .readnib
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- cmp #$D5
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bne .checkkey3
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bne --
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jsr .readnib
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-- cmp #$FF
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cmp #$FF
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bne -
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jsr .readnib
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cmp #$DD
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bne -- ; this is the same bug
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nop ; timing bits
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nop ; timing bits
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nop ; timing bits
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bne - ; this had the same bug
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ldx #$00
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- jsr .read4x4
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sta BASEPAGE<<8,x
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inx
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bne -
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.copywrite2
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lda $2100,x
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sta (BASEPAGE+7)<<8,x
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inx
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bne .copywrite2
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rts
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++ rts
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.read4x4
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- lda $C0EC
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@ -359,7 +343,7 @@ ReadChoplifter
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txa
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sta (modsrc),y
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tya
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adc #$17 ; carry set by sbc
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adc #$18-1 ; carry set by sbc
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tay
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txa
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adc #$0F
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@ -382,14 +366,15 @@ ReadChoplifter
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jmp $4000
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.resume
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ldy #0
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- lda .stager,y
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sta $500,y
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lda (*+$ff) and $ff00,y
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sta $200,y
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lda (*+$1ff) and $ff00,y
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sta $400,y
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iny
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ldx #0
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- lda .stager,x
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sta $500,x
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lda (*+$ff) and $ff00,x
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sta $200,x
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lda (*+$1ff) and $ff00,x
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sta $400,x
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txs
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inx
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bne -
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jsr .dostep4
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ldy #2 ; pagehi, first table
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@ -408,10 +393,10 @@ ReadChoplifter
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sta $801
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lda #2
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sta $27
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jsr $823 ; read half of write routine to $200 (but starts at $207)
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jsr $823 ; read write routine to $200 (but starts at $207)
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inc $27
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jsr $823 ; read patch table to $400
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ldy #0 ; avoid CFFA bug
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ldy #0 ; avoid CFFA bug (Y is not zero on return)
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- lda $400,y
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sta .patcher+1
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lda $401,y
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@ -428,14 +413,10 @@ ReadChoplifter
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jsr .dostep2 ; reach track $22
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sta $3d
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dec $27
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jsr $823 ; read high scores
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inc $27
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jsr $823 ; read half of write routine to $600
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ldy #0 ; avoid CFFA bug
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- lda ($26),y
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jsr $823 ; read high scores to $400
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ldy #0 ; avoid CFFA bug (Y is not zero on return)
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- lda $700,y
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sta $800,y
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lda $600,y
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sta $300,y
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iny
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bne -
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lda $C088,x
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@ -457,6 +438,6 @@ ReadChoplifter
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jsr $82F
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lsr $40
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rts
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}
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}
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} ;$5xx
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} ;$Bxxx
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}
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