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newscroll-faster.asm
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// Variable Labels
.label scrollindex = $2000
.label D016value = $2001
.label c = $2002
.label j = $2004
.label i = $2006
* = $0801
BasicUpstart($080E)
* = $080E
// Set Scroll Index to 0
lda #$00
sta scrollindex
// 38 Column Mode
lda $D016
and #$F7
sta $D016
sta D016value
// Set Colour Map
jsr setColours
// setup the first int routine
// at scanline #$82
sei
lda #$7F
sta $DC0D
sta $DD0D
lda #$01
sta $D01A
lda #$82
sta $D012
lda $D011
and #$7F
sta $D011
lda #>scrollTopHalfOfScreen
sta $0315
lda #<scrollTopHalfOfScreen
sta $0314
cli
rts
scrollTopHalfOfScreen:
// Ack
asl $D019
// BG and BDR colours for top
lda #$00
sta $D021
sta $D020
// Get the XScroll and
// add the current index to it
lda $D016
// also 38 col mode
and #$F0
clc
adc scrollindex
sta D016value
//ora #$08
sta $D016
// Top of IF statement
// if Memory (820 dec) is 1, scroll Right
lda $0334
cmp #$01
bne LBL1L3 // (branch to ELSE)
// Top of IF statement
// if xscroll is !=0 branch out of IF
ldx scrollindex //
bne LBL2L3 //
// memcopy //
jsr moveTopL2R //
// increase the scroll index <---//
LBL2L3:
inc scrollindex
lda #$07
and scrollindex
sta scrollindex
jmp LBL1L4
// ELSE
LBL1L3:
// Top of IF statement
// if xscroll index is 7 perform memcopy
lda scrollindex
cmp #$07
bne LBL2L8 // branch out of IF
// memcopy
jsr moveTopR2L
// Subtract 1 from Scroll Index
LBL2L8:
dec scrollindex
lda #$07
and scrollindex
sta scrollindex
// setup next interrupt routine
// at scan line: #$82
LBL1L4:
sei
lda #$7F
sta $DC0D
sta $DD0D
lda #$01
sta $D01A
lda #$82
sta $D012
lda $D011
and #$7F
sta $D011
lda #>scrollBottomHalfOfScreen
sta $0315
lda #<scrollBottomHalfOfScreen
sta $0314
cli
jmp $EA31
// Doesn't Actually Scroll Bottom Half of Screen
scrollBottomHalfOfScreen:
// ack
asl $D019
// BG and BDR colours for botttom
lda #$06
sta $D021
lda #$0E
sta $D020
// set X Scroll to 0
lda #$08
sta $D016
// set up next interrupt routine
// @ scanline #$FF
sei
lda #$7F
sta $DC0D
sta $DD0D
lda #$01
sta $D01A
lda #$FF
sta $D012
lda $D011
and #$7F
sta $D011
lda #>scrollTopHalfOfScreen
sta $0315
lda #<scrollTopHalfOfScreen
sta $0314
cli
jmp $EA31
// Mem Copy for scrolling Right to Left
moveTopR2L:
// Temporarily store the Left column
lda $0400
pha
lda $0428
pha
lda $0450
pha
lda $0478
pha
lda $04A0
pha
lda $04C8
pha
lda $04F0
pha
lda $0518
pha
lda $0540
pha
lda $0568
pha
ldx #$00
!:
lda $0401,X
sta $0400,X
lda $0429,X
sta $0428,X
lda $0451,X
sta $0450,X
lda $0479,X
sta $0478,X
lda $04A1,X
sta $04A0,X
lda $04C9,X
sta $04C8,X
lda $04F1,X
sta $04F0,X
lda $0519,X
sta $0518,X
lda $0541,X
sta $0540,X
lda $0569,X
sta $0568,X
inx
cpx #$27
bne !-
// put what _used_ to be in the left column in
// the right column
pla
sta $058F
pla
sta $0567
pla
sta $053F
pla
sta $0517
pla
sta $04EF
pla
sta $04C7
pla
sta $049F
pla
sta $0477
pla
sta $044F
pla
sta $0427
rts
// Mem Copy for scrolling Left to Right
moveTopL2R:
// temp. store right column
lda $0427
pha
lda $044F
pha
lda $0477
pha
lda $049F
pha
lda $04C7
pha
lda $04EF
pha
lda $0517
pha
lda $053F
pha
lda $0567
pha
lda $058F
pha
ldx #$27
!:
lda $03FF,X
sta $0400,X
lda $0427,X
sta $0428,X
lda $044F,X
sta $0450,X
lda $0477,X
sta $0478,X
lda $049F,X
sta $04A0,X
lda $04C7,X
sta $04C8,X
lda $04EF,X
sta $04F0,X
lda $0517,X
sta $0518,X
lda $053F,X
sta $0540,X
lda $0567,X
sta $0568,X
dex
bne !-
// put what _used_ to be in right column into
// left column
pla
sta $0568
pla
sta $0540
pla
sta $0518
pla
sta $04F0
pla
sta $04C8
pla
sta $04A0
pla
sta $0478
pla
sta $0450
pla
sta $0428
pla
sta $0400
rts
setColours:
lda #<COLOURMAP
sta c
lda #>COLOURMAP
sta c+1
lda c // c
ldx c+1
sta j
stx j+1
lda $02
pha
lda $03
pha
php
clc
LBL1L6:
lda #$00
ldx #$D8
sta i
stx i+1
LBL1L7: // Top of FOR Loop
lda i+1
cmp #$D9
bne !+
lda i
cmp #$90
!:
.byte $B0, $03 // BCS +3
jmp LBL1L9 // if c==0 jump to BODY
jmp LBL1L10 // jump out of FOR
LBL1L8:
clc
lda #$01
adc i
sta i
lda #$00
adc i+1
sta i+1
jmp LBL1L7 // jump to top of FOR loop
LBL1L9:
ldy #$00
lda j
ldx j+1
sta !+
stx !++
.byte $AD
!:
.byte $00
!:
.byte $00
sta LBL2L10-2
lda i
sta !+
lda i+1
sta !++
lda #$00
.byte $A9, $00
.byte $8D // <-- STA absolute
!:
LBL2L10: // <-- low byte
.byte $00
!:
LBL2L11: // <-- hi byte
.byte $00
clc
lda #$01
adc j
sta j
lda #$00
adc j+1
sta j+1
jmp LBL1L8 // jump to iterator
LBL1L10:
plp
pla
sta $03
pla
sta $02
rts
COLOURMAP:
.byte $00, $00, $00, $00, $00, $00, $0B, $0B, $0C, $0C, $0C, $0F, $0F, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0F, $0C, $0C, $0C, $0B, $0B, $00, $00, $00, $00, $00
.byte $00, $00, $00, $00, $00, $00, $0B, $0B, $0C, $0C, $0C, $0F, $0F, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0F, $0C, $0C, $0C, $0B, $0B, $00, $00, $00, $00, $00
.byte $00, $00, $00, $0B, $0B, $0B, $0B, $0B, $0C, $0C, $0F, $01, $01, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0C, $0C, $0B, $0B, $0B, $0B, $0B, $00, $00, $00
.byte $00, $00, $0B, $0B, $0B, $0B, $0B, $0C, $0C, $0C, $0F, $01, $01, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0C, $0C, $0C, $0B, $0B, $0B, $0B, $0B, $00, $00
.byte $00, $0B, $0B, $0B, $0B, $0B, $0B, $0B, $0C, $0C, $0F, $01, $01, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0C, $0C, $0B, $0B, $0B, $0B, $0B, $0B, $0B, $00
.byte $0B, $0B, $0B, $0B, $0C, $0C, $0C, $0C, $0F, $01, $01, $01, $01, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0C, $0C, $0C, $0C, $0B, $0B, $0B, $0B
.byte $0B, $0B, $0B, $0B, $0C, $0C, $0C, $0C, $0F, $01, $01, $01, $01, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0C, $0C, $0C, $0C, $0B, $0B, $0B, $0B
.byte $00, $00, $00, $00, $00, $0B, $0B, $0B, $0C, $0C, $0F, $01, $01, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0C, $0C, $0B, $0B, $0B, $00, $00, $00, $00, $00
.byte $00, $00, $00, $00, $00, $0B, $0B, $0B, $0C, $0C, $0F, $01, $01, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0C, $0C, $0B, $0B, $0B, $00, $00, $00, $00, $00
.byte $00, $00, $00, $00, $00, $0B, $0B, $0B, $0C, $0C, $0F, $01, $01, $01, $01, $01, $01, $01, $01, $01
.byte $01, $01, $01, $01, $01, $01, $01, $01, $01, $0F, $0C, $0C, $0B, $0B, $0B, $00, $00, $00, $00, $00