55 lines
1002 B
Plaintext
55 lines
1002 B
Plaintext
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( comment )
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:dev/r fff8 ( const read port )
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:dev/w fff9 ( const write port )
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;x 2 ;y 2
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|0100 @RESET
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#05 ,dev/r STR ( set dev/read to ctrl )
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#04 ,dev/w STR ( set dev/write to ppu-sprite )
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#0080 ,x STR2
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#0040 ,y STR2
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#01 ,cursor_icn ,x LDR2 ,y LDR2 ,putsprite JSR
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BRK
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|0200 @SPRITESHEET
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@cursor_icn .80c0 .e0f0 .f8e0 .1000 .0000 .0000 .0000 .0000
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@star_icn .1054 .28c6 .2854 .1000 .0000 .0000 .0000 .0000
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BRK
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|c000 @FRAME
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#00 IOR #10 NEQ ,next0 ROT JMP? POP2
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,y LDR2 #0001 SUB2 ,y STR2
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@next0
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#00 IOR #20 NEQ ,next1 ROT JMP? POP2
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,y LDR2 #0001 ADD2 ,y STR2
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@next1
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#00 IOR #40 NEQ ,next2 ROT JMP? POP2
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,x LDR2 #0001 SUB2 ,x STR2
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@next2
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#00 IOR #80 NEQ ,next3 ROT JMP? POP2
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,x LDR2 #0001 ADD2 ,x STR2
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@next3
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( redraw )
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#01 ,cursor_icn ,x LDR2 ,y LDR2 ,putsprite JSR
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BRK
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@putsprite
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IOW2 ( y short )
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IOW2 ( x short )
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IOW2 ( sprite address )
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IOW ( redraw byte )
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RTS
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|d000 @ERROR BRK
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|FFFA .RESET .FRAME .ERROR
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