Faster 6502 decompressor for v1 that runs on ROM

[H-A-M-G-E-R]

i want to lzsa1 on the NES
like https://github.com/emmanuel-marty/lzsa/blob/master/asm/6502/decompress_faster_v1.asm but it runs on ROM instead of RAM

[msaarna]

I'm not affiliated with this project, but a while back I adapted the decompressor for the Atari 7800. Same as you, we need it to run out of rom, so I replace the self-modifying code. I also added a speed optimisation to the cp_byte loop that typically squeezes out another ~10%. (uses a bit more rom)

https://github.com/7800-devtools/7800basic/blob/master/includes/lzsa1compression.asm

Heads up I also moved it to dasm format.