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