Race all sorts of roms - Githubissues

emu-russia / dmgcpu

DMG CPU Reverse Engineering

Creative Commons Zero v1.0 Universal

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Race all sorts of roms #204

Open ogamespec opened 1 year ago

ogamespec commented 1 year ago

In the lazy mode to try all sorts of roms in the simulator and check that there is something moving.

[ ] Develop a methodology for testing and formalizing test results for some opcode
[ ] Test 1 opcode
[ ] Repeat n times for all opcodes

ogamespec commented 5 months ago

I think that within the scope of this Issue it is enough to run blargg's cpu_instrs test and rest easy on that.

ogamespec commented 5 months ago

https://github.com/retrio/gb-test-roms/tree/master/cpu_instrs

ogamespec commented 5 months ago

Replaced JP 0x100 from address 0 to go to ROM entrypoint. Something is happening:

ogamespec commented 5 months ago

I don't know how many years it will take to run a full test, but 100,000 cycles took about 20 minutes. So I don't know how to test it all.... Just run it for a week... and? Need to figure out how to stop the test and say it completed successfully or with an error.

ogamespec commented 5 months ago

The strategy for this task changes again. We will test each opcode separately, since the simulation speed is too slow.

ogamespec commented 3 months ago

The methodology is worked out more or less:

Instead of 1 opcode per execution, testall.asm with all SM83 opcodes is run
A pool of signals is formed for monitoring (SM83 context and important internal signals).
The obtained waves are thoughtfully examined for illogical operation of opcodes
After verification, the resulting waves are used as a reference ("standard")

ogamespec commented 3 months ago

Ha! It's all been done before us:

https://github.com/SingleStepTests/sm83