mirror of https://github.com/stella-emu/stella.git
428 lines
3.4 KiB
NASM
428 lines
3.4 KiB
NASM
;;A demo for the F4 banking scheme. 8 4K banks (32K total)
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;;By: Rick Skrbina 4/30/09
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processor 6502
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include "vcs.h"
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include "macro.h"
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Bank0_Read equ Bank0_Write+128
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seg.u vars
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org $80
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seg.u SC_RAM
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org $1000
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Bank0_Write ds 1
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seg bank0
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org $8000
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rorg $F000
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repeat 256
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.byte $FF
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repend
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Start0
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nop
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nop
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nop
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CLEAN_START
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Start_Frame
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lda #2
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sta VBLANK
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sta VSYNC
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sta WSYNC
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sta WSYNC
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sta WSYNC
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lsr
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sta VSYNC
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; lda #$0F
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; sta COLUBK
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ldy #37
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VerticalBlank
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sta WSYNC
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dey
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bne VerticalBlank
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lda #0
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sta VBLANK
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clc
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lda Bank0_Read
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adc #1
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sta Bank0_Write
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lda Bank0_Read
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sta COLUBK
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sta WSYNC
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ldy #23
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Picture0
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sta WSYNC
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dey
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bne Picture0
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jsr Swch1
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ldy #23
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Picture1
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sta WSYNC
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dey
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bne Picture1
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jsr Swch2
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ldy #23
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Picture2
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sta WSYNC
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dey
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bne Picture2
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jsr Swch3
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ldy #23
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Picture3
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sta WSYNC
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dey
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bne Picture3
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jsr Swch4
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ldy #23
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Picture4
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sta WSYNC
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dey
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bne Picture4
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jsr Swch5
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ldy #23
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Picture5
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sta WSYNC
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dey
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bne Picture5
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jsr Swch6
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ldy #23
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Picture6
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sta WSYNC
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dey
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bne Picture6
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jsr Swch7
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ldy #23
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Picture7
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sta WSYNC
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dey
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bne Picture7
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lda #2
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sta VBLANK
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ldy #30
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OverScan
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sta WSYNC
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dey
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bne OverScan
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jmp Start_Frame
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org $8FC0
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rorg $FFC0
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Swch7
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lda $FFFB
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nop
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nop
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nop
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nop
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nop
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nop
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rts
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org $8FD0
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rorg $FFD0
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Swch1
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lda $FFF5
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Swch2
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lda $FFF6
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Swch3
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lda $FFF7
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rts
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rts
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rts
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rts
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rts
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rts
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rts
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org $8FE0
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rorg $FFE0
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Swch4
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lda $FFF8
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Swch5
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lda $FFF9
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Swch6
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lda $FFFA
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rts
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rts
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rts
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rts
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rts
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rts
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rts
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org $8FFC
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rorg $FFFC
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.word Start0
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.byte "B0"
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seg bank1
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org $9000
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rorg $F000
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repeat 256
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.byte $FF
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repend
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Start1
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lda $FFF4
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Bank1Sub
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lda #$1F
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sta WSYNC
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sta COLUBK
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rts
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org $9FD0
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rorg $FFD0
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nop
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nop
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nop
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jsr Bank1Sub
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sta $FFF4
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org $9FFC
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rorg $FFFC
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.word Start1
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.byte "B1"
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seg bank2
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org $A000
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rorg $F000
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repeat 256
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.byte $FF
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repend
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Start2
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lda $FFF4
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Bank2Sub
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lda #$2F
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sta WSYNC
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sta COLUBK
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rts
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org $AFD0
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rorg $FFD0
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nop
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nop
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nop
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nop
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nop
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nop
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jsr Bank2Sub
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sta $FFF4
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org $AFFC
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rorg $FFFC
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.word Start2
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.byte "B2"
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seg bank3
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org $B000
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rorg $F000
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repeat 256
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.byte $FF
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repend
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Start3
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lda $FFF4
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Bank3Sub
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lda #$3F
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sta WSYNC
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sta COLUBK
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rts
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org $BFD0
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rorg $FFD0
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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jsr Bank3Sub
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sta $FFF4
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org $BFFC
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rorg $FFFC
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.word Start3
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.byte "B3"
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seg bank4
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org $C000
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rorg $F000
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repeat 256
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.byte $FF
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repend
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Start4
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lda $FFF4
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Bank4Sub
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lda #$4F
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sta WSYNC
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sta COLUBK
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rts
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org $CFE0
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rorg $FFE0
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nop
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nop
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nop
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jsr Bank4Sub
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sta $FFF4
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org $CFFC
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rorg $FFFC
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.word Start4
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.byte "B4"
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seg bank5
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org $D000
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rorg $F000
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repeat 256
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.byte $FF
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repend
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Start5
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lda $FFF4
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Bank5Sub
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lda #$5F
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sta WSYNC
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sta COLUBK
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rts
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org $DFE0
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rorg $FFE0
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nop
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nop
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nop
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nop
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nop
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nop
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jsr Bank5Sub
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sta $FFF4
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org $DFFC
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rorg $FFFC
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.word Start5
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.byte "B5"
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seg bank6
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org $E000
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rorg $F000
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repeat 256
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.byte $FF
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repend
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Start6
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lda $FFF4
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Bank6Sub
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lda #$6F
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sta WSYNC
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sta COLUBK
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rts
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org $EFE0
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rorg $FFE0
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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jsr Bank6Sub
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sta $FFF4
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org $EFFC
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rorg $FFFC
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.word Start6
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.byte "B6"
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seg bank7
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org $F000
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rorg $F000
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repeat 256
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.byte $FF
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repend
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Start7
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lda $FFF4
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Bank7Sub
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lda #$8F
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sta WSYNC
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sta COLUBK
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rts
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org $FFC0
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rorg $FFC0
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nop
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nop
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nop
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jsr Bank7Sub
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sta $FFF4
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org $FFFC
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rorg $FFFC
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.word Start7
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.byte "B7"
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