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jwestfall69 / neogeo-diag-bios

Disassembly of smkdan's Neo Geo Diagnostics BIOS with added features
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Why doesn't AES + C Button do write enable tests on backup ram #16

Closed jwestfall69 closed 9 months ago

jwestfall69 commented 4 years ago

Holding C on AES hardware triggers backup ram tests, but for some reason it's nop'd for the write enable test?

        tst.b   REG_STATUS_B
        bmi     .do_bram_test                           ; if MVS jump to bram test
        btst    #6, REG_P1CNT                           ; dead code? checking if C is pressed, then nop
        nop                                             ; maybe nop should be 'bne .do_bram_test' to allow forced bram test on aes?
        moveq   #0, d0
        PSUB_RETURN

.do_bram_test:

I've never even heard of a mod to add backup ram to an AES...

jwestfall69 commented 9 months ago

I removed the C option to test backup ram on AES