126 lines
3.1 KiB
Plaintext
126 lines
3.1 KiB
Plaintext
processor 6502
|
|
include "vcs.h"
|
|
include "macro.h"
|
|
include "xmacro.h"
|
|
|
|
seg.u Variables
|
|
org $80
|
|
|
|
Temp byte
|
|
LoopCount byte
|
|
|
|
THREE_COPIES equ %011
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
seg Code
|
|
org $f000
|
|
|
|
Start
|
|
CLEAN_START
|
|
|
|
NextFrame
|
|
VERTICAL_SYNC
|
|
|
|
TIMER_SETUP 37
|
|
lda #64
|
|
sta LoopCount ; scanline counter
|
|
lda #$ff
|
|
sta COLUBK ; background color
|
|
lda #$22
|
|
sta COLUP0 ; show how players alternate
|
|
lda #$12
|
|
sta COLUP1 ; by having different colors
|
|
lda #THREE_COPIES
|
|
sta NUSIZ0
|
|
sta NUSIZ1 ; both players have 3 copies
|
|
sta WSYNC
|
|
SLEEP 20
|
|
sta RESP0 ; position 1st player
|
|
sta RESP1 ; ...and 2nd player
|
|
lda #$10
|
|
sta HMP1 ; 1 pixel to the left
|
|
sta WSYNC
|
|
sta HMOVE ; apply HMOVE
|
|
sta HMCLR
|
|
lda #1
|
|
sta VDELP0 ; we need the VDEL registers
|
|
sta VDELP1 ; so we can do our 4-store trick
|
|
TIMER_WAIT
|
|
|
|
TIMER_SETUP 192
|
|
|
|
SLEEP 40 ; start near end of scanline
|
|
BigLoop
|
|
ldy LoopCount ; counts backwards
|
|
lda Bitmap0,y ; load B0 (1st sprite byte)
|
|
sta GRP0 ; B0 -> [GRP0]
|
|
lda Bitmap1,y ; load B1 -> A
|
|
sta GRP1 ; B1 -> [GRP1], B0 -> GRP0
|
|
sta WSYNC ; sync to next scanline
|
|
lda Bitmap2,y ; load B2 -> A
|
|
sta GRP0 ; B2 -> [GRP0], B1 -> GRP1
|
|
lda Bitmap5,y ; load B5 -> A
|
|
sta Temp ; B5 -> temp
|
|
ldx Bitmap4,y ; load B4 -> X
|
|
lda Bitmap3,y ; load B3 -> A
|
|
ldy Temp ; load B5 -> Y
|
|
sta GRP1 ; B3 -> [GRP1]; B2 -> GRP0
|
|
stx GRP0 ; B4 -> [GRP0]; B3 -> GRP1
|
|
sty GRP1 ; B5 -> [GRP1]; B4 -> GRP0
|
|
sta GRP0 ; ?? -> [GRP0]; B5 -> GRP1
|
|
dec LoopCount ; go to next line
|
|
bpl BigLoop ; repeat until < 0
|
|
|
|
TIMER_WAIT
|
|
|
|
TIMER_SETUP 30
|
|
TIMER_WAIT
|
|
jmp NextFrame
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; Bitmap data, six columns
|
|
|
|
align $100 ; ensure we start on a page boundary
|
|
Bitmap0
|
|
hex 00
|
|
hex 00000000000000000000000000000000
|
|
hex 00000000000000000000000000000001
|
|
hex 01010205040402040404040404040404
|
|
hex 040404060203000107df7f1f0f000000
|
|
Bitmap1
|
|
hex 00
|
|
hex 0000073f1f0303000000000000010704
|
|
hex 0808101010101412120a0a1e75c38000
|
|
hex 0000076260e0e0e0c0c0e0e0c0c00000
|
|
hex 00000000408170feffffffffc7030000
|
|
Bitmap2
|
|
hex 00
|
|
hex 007ffffcf0e0c0404040404020bb7608
|
|
hex 000402020809094f494949fa07010000
|
|
hex 00000000006070f0f0f0c0e0e0e0e0e0
|
|
hex 400000000010a06010e0e0f1ffff7f00
|
|
Bitmap3
|
|
hex 00
|
|
hex 3effff07010000000000302159878184
|
|
hex 848efeffffff9f0f0e9c7c0402c12010
|
|
hex 08040207050000000002020104070f0f
|
|
hex 0f070703030707070f1f7efcf8f0c000
|
|
Bitmap4
|
|
hex 00
|
|
hex 00f0f0fffff0404040404080641e02c3
|
|
hex 4242c3e2e2f4fcfc787838787cfa3131
|
|
hex 6102021cf840c04042a022c14080c4c3
|
|
hex c0c0c0c0808090900010180c04243800
|
|
Bitmap5
|
|
hex 00
|
|
hex 000000fcfefc1c0c040402020202040c
|
|
hex f800e01804040402020101010111e192
|
|
hex dc700000000000000000000080808000
|
|
hex 00000000000000000000000000000000
|
|
|
|
; Epilogue
|
|
org $fffc
|
|
.word Start
|
|
.word Start
|