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view timer.s16 @ 57:c44170825b16
Implement lsli and lsri in assembler
author | Michael Pavone <pavone@retrodev.com> |
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date | Thu, 01 Sep 2016 21:52:48 -0700 |
parents | cb078b3b23e8 |
children |
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ldim vectors, r0 setvbr r0 ;current color value ldim 0, r0 ;color increment ldim $41, r3 ldimh $8, r3 ;Palette RAM address/length ldim 1, r1 ;enable interrupt ori 1, sr ;Timer Value ldim $FF, r2 ldimh $FF, r2 outi $A, r2 wait bra wait ;shouldn't get here, disable timer so it's clear something broke ldim 0, r2 outi $A, r2 bra wait vectors: dc.w timer_handler timer_handler outi $E, r1 outi $E, r0 add r3, r0, r0 reti r4