Fails Blargg's GB-Z80 CPU Test program

Dwedit · Post by **Dwedit** » Mon Jan 19, 2009 7:06 pm

Blargg made a GB-Z80 testing program: http://h1.ripway.com/blargg/temp/gb_cpu_test.zip

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Among the instructions that fail are:

E8: ADD SP,nn

F8: LD HL,SP+nn

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Those instructions are quite deceptive with what they do to flags: They use the lower byte of SP added to the unsigned byte to determine halfcarry and carry flags. All other flags are cleared.

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Several other tests also fail.

mudlord · Post by **mudlord** » Thu Feb 12, 2009 9:59 am

I'm sure the active developers will try and solve these inaccuracies.....

Squall Leonhart · Post by **Squall Leonhart** » Thu Feb 12, 2009 10:31 pm

what do you mean by active being bolded

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.< are you saying i do nothing >.<

jbo_85 · Post by **jbo_85** » Sat Aug 08, 2009 4:11 pm

The instructions are fixed in SVN. The only thing that doesn't work with Blargg's test roms is the read/write mem timing.

mudlord · Post by **mudlord** » Mon Aug 10, 2009 1:43 am

Nice, I really should get back into devel.

Exophase · Post by **Exophase** » Tue Aug 11, 2009 12:32 pm

Neat, maybe I'll try this with my unreleased GB emulator too. I love CPU test ROMs! blargg is my hero. Maybe I can convince him to write something for ARM7 and maybe ARM9? Although we do have armwrestler it doesn't check ldm/stm correctly and those can be surprisingly tricky. It'd be great if there was a test ROM for GBA timings as well.