base:swapping_zp_data
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| — | base:swapping_zp_data [2015-04-17 04:34] (current) – created - external edit 127.0.0.1 | ||
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| + | ====== Swapping ZeroPage data ====== | ||
| + | On some occasions you might want to save and restore ZP data. I.e. you have no time to patch a SID player, or the speedup you gain by giving several routines full ZP access is worth it. The small snippet below swaps 10 bytes from $00 on with memory in $10. It clutters X,Y and A though. Enjoy, enthusi. | ||
| + | |||
| + | < | ||
| + | ldx #10 | ||
| + | loop | ||
| + | ldy $00,x | ||
| + | lda $10,x | ||
| + | sta $00,x | ||
| + | sty $10,x | ||
| + | | ||
| + | bpl loop | ||
| + | </ | ||
base/swapping_zp_data.txt · Last modified: 2015-04-17 04:34 by 127.0.0.1