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Coding for speed on 6502

(1st version: ~200 cycles)
(2nd version: 38 cycles)
(3rd version: 12 cycles)
(4th version: 4 cycles, but requires 256 bytes of memory)
#RetroComputing

A "cosmic brain" meme showing how one goes from a naive to a fast approach to get three-quarters of an 8bits value.
- A = X*3/4
- A = (2X+X)/4
- A = (X+X/2)/2
- A = three_quarters_table,X — A "cosmic brain" meme showing how one goes from a naive to a fast approach to get three-quarters of an 8bits value. - A = X*3/4 - A = (2X+X)/4 - A = (X+X/2)/2 - A = three_quarters_table,X

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