3 ms·

http://6502.org/source/general/SWN.html http://6502.org/source/general/SWN.html swaps the nybbles in A in 8 bytes/12 cycles. That’s not quite what you need, but

http://6502.org/source/general/SWN.html http://6502.org/source/general/SWN.html swaps the nybbles in A in 8 bytes/12 cycles. That’s not quite what you need, but may give you ideas.

oconnor663 5y ago
Oh that looks perfect. I'll have to try it out today and report back.