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base:swapping_zp_data

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 
   dex 
   bpl loop
base/swapping_zp_data.txt · Last modified: 2015-04-17 04:34 (external edit)