Well, it does break. Maybe it won't be an easy fix, although I haven't found any C emulator with all illegal opcodes.
You could take a look at my MCL64 which is a 6510 emulator written in C and supports the undocumented/unstable opcodes fairly well when used as a drop-in replacement into a ...

okay so... I could not adapt it, it just hangs on some instruction forever!
https://github.com/LTVA1/siddump/tree/broken

Well, it does break. Maybe it won't be an easy fix, although I haven't found any C emulator with all illegal opcodes.
You could take a look at my MCL64 which is a 6510 emulator written in C and supports the undocumented/unstable opcodes fairly well when used as a drop-in replacement into a ...

I would probably check to see how good the emulation is of the instructions with https://github.com/Klaus2m5/6502_65C02_functional_tests and my cycle timing checker which includes undocumented instructions : https://github.com/dp111/6502Timing
Actually no need now, I have the source code so I see ...

Well, it does break. Maybe it won't be an easy fix, although I haven't found any C emulator with all illegal opcodes.
You could take a look at my MCL64 which is a 6510 emulator written in C and supports the undocumented/unstable opcodes fairly well when used as a drop-in replacement into a ...

Ok so I corrected program counter increments and now Lunatico sids actually write some data to SID registers, but it seems like the program is being stuck in short loop since after some time it starts to output repeating portions of nonsensical data (e.g. C-0 notes over and over again which isn't ...

Well, it does break. Maybe it won't be an easy fix, although I haven't found any C emulator with all illegal opcodes.

Welcome!

A quick look suggests that you'd need
WRITE(ABSOLUTE());
in some appropriate place(s).
Hmm, I was worried that this might be the case since WRITE(foo) just does nothing (it has something commented out). I will try to add the actual WRITE() functionality first and see if it doesn't break.

Hello. I have forked this nice tool: https://github.com/LTVA1/siddump. In cpu.c I tried to add some illegal opcodes support (search by word "Lunatico"), but when I try to use the program on Lunatico sid files I don't get any SID registers writes but they should happen. This means that the 4 opcodes ...