2018-08-13 22:17:36 +00:00
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2016-12-16 01:21:51 +00:00
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processor 6502
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include "vcs.h"
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include "macro.h"
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include "xmacro.h"
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2018-10-01 01:07:45 +00:00
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; This example demonstrates an asymmetric playfield, which
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; allows different patterns for the left and right sides of
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; the playfield, giving you 40 unique playfied pixels per line.
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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2016-12-16 01:21:51 +00:00
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seg.u Variables
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org $80
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seg Code
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org $f000
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Start
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CLEAN_START
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NextFrame
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VERTICAL_SYNC
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TIMER_SETUP 37
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; Set playfield foreground and background
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lda #$FF
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sta COLUBK
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lda #$F0
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sta COLUPF
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TIMER_WAIT
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ldy #192
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ScanLoop
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; WSYNC and store playfield registers
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sta WSYNC
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lda PFBitmap0,y
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sta PF0 ; store first playfield byte
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lda PFBitmap1,y
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sta PF1 ; store 2nd byte
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lda PFBitmap2,y
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sta PF2 ; store 3rd byte
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; Here's the asymmetric part -- by this time the TIA clock
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; is far enough that we can rewrite the same PF registers
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; and display new data on the right side of the screen
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nop
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nop
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nop ; pause to let playfield finish drawing
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lda PFBitmap3,y
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sta PF0 ; store 4th byte
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lda PFBitmap4,y
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sta PF1 ; store 5th byte
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lda PFBitmap5,y
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sta PF2 ; store 6th byte
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dey
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bne ScanLoop ; repeat until all scanlines drawn
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; Reset playfield
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SLEEP 14 ; give time to finish drawing scanline
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lda #0
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sta PF0
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sta PF1
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sta PF2 ; clear playfield
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2018-08-26 13:19:09 +00:00
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TIMER_SETUP 28
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2016-12-16 01:21:51 +00:00
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TIMER_WAIT
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jmp NextFrame
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; BITMAP DATA - Ada Lovelace
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PFBitmap0
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hex 00
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hex a070d0b0d0b0e050f0d0b0f050f060b0
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hex f0d070b060f050f0a0f050f050f0d070
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hex d0b0d0b0d0b050f050f0a0f0a0f060b0
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hex e0b0e0d0f0d0b0f0a070d070d0b0e0b0
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hex 60f0a0f050f0b0d0f0d0f0d0f0d0f0f0
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hex e0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0
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hex f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0
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hex f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0
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hex f0f0e0f0f0f0e0f0f0f0f0d0f0f0e0f0
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hex d0f0b0f070b0f0d0f0d0b0d0f0d0b0d0
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hex f0d0b0f0a0f0e0b0e050f0d0b070a0f0
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hex b0b0e0b070d070f050f0b0f060f0b0f0
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PFBitmap1
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hex 00
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hex fedf7fdf7fdfbeffde7ffe5fff5fffaf
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hex 77b7dfafff5fef7faf77ef5ff7ae7fae
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hex f75eef7aaff6dfb7de775ff65ff6affe
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hex aeff5efe5efebe7efefefffefe7efefe
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hex fefefefefefefefefdfefefefefefefe
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hex fcfef6fefcfefefefef6fef6fef6eef7
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hex eefeeffffffffeffbfffffdfffdeffdf
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hex fefefffeff7fffffffbfffbfbfbfbe9f
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hex bfbfffffffffffffffffffffffffffff
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hex fffffffffbffbdf75ff55ff56ff55ff5
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hex 5ff55ff55ff55ef75af7de75dff5de77
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hex de75dff5dffbaefbaffb6edbbeef55ff
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PFBitmap2
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hex 00
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hex 375f555f2f55975b4729430103000101
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hex 00010000010000000000000001000108
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hex 05040a0409040414242834041c040e06
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hex 04020200010401040406140a1a0c0a05
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hex 04010001000001000000000000000000
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hex 00000000000000000000000081020104
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hex 050e060d8e0d0f0f070605800009060e
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hex 85060404040406070303030000000000
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hex 00000000000000000000000100010001
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hex 01010101010101030303030703030706
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hex 070d0f0a1b1307050b9ff5f7f7e5cf8d
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hex 1f153e7bf6fbfdd7fab7bdf7adffaaff
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PFBitmap3
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hex 00
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hex f0f0f0f0e0f0e0e0d0a0d0a0d0c0d0c0
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hex c0a08080408000808080808000000000
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hex 00000000000080008000800080808000
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hex 80808000808080008000800080000000
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hex 00000000000000000000000000000000
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hex 0000000080c0104040e0c0c0e0c0e0c0
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hex 70e060a000804090706050200090a0c0
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hex e0706030000000000000000000000000
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hex 00000000000000000000000000000000
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hex 00000000000000000000000000008080
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hex 80400000808080c0e0f0f0f0f0f07030
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hex 00000080f0f0f0f0f0f0f0f0f0f0e0f0
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PFBitmap4
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hex 00
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hex fffffffffbfffbfffdfffffefffffeff
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hex ffffffffffffffffffffffffffffff7f
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hex ffffffffffffffffffffffffffffffff
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hex ffffffffffffffffffffffffffffffff
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hex ffffffffffffff7fff7fff7f7f7f7f7f
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hex 7f7f7f7f7f3d7fbfbfffbfbf3fbf3d1f
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hex 3f1f3f1f3f1f1f3f1f5f1f9f1f9f1f1f
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hex 1f1f1f0f1f0f1f1f1f1f3f1f3f1f3f3f
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hex 3f3f3f3e3e3f3f3f7e3c7c3c7d3c7c38
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hex 7879797872787270f262e0e3c3cb9b39
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hex 327a79fafafaf0e1e1e0c185cd0c9d3c
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hex 3efeffffffffffffffffffffffffffff
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PFBitmap5
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hex 00
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hex ffffffffffffffffffffffffffffffff
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hex fffffeffffffffffffffffffffffffff
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hex fffffffffbffffffffffffffffffffff
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hex ffffffffffffffffffffffffffffffff
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hex ffffffffffffffffffffff7fffffffff
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hex ffffffffffffffffffff7fffffffffff
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hex ffffffffffffffffffffffffffffffff
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hex ffffffffffffffffffbf3f3fbf1fbf9f
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hex bf9efb8ddf9098c1c0c8c1d0b080b080
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hex 9080918ccac4c2c2c2e0c2c2d2808190
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hex 80a0e0f0e0f0f1e2e1c1c0c0e2c1e0e1
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hex e9f9fafafcf8fcfeffffffffffffffff
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; Epilogue
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org $fffc
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.word Start
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.word Start
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