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jwestfall69 / neogeo-diag-bios

Disassembly of smkdan's Neo Geo Diagnostics BIOS with added features
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Is some kind of benchmark possible ? #18

Closed Ryoandr closed 4 months ago

Ryoandr commented 3 years ago

I have an MVS board that shows more slowdowns than others, same model board, MV1FZ. It's very noticiable when doing supers in LB2 with Kojiro, with the d,d+A/B I really have to compensate each input for the slowdown, and with qcb,f+AB each hit really slows down.

This particular board also happens to have problems with GBS-Control board, has jumpy sync. I tried replacing the crystal in case it drifted but same results. I tried to scope NEO-D0 clocks but I couldn't see anything different than other boards (it's a crappy scope tho). I'm thinking LSPC2 as sync also comes from it, but it's kind of a pain to replace, so if someone ever had issue like this... So I was wondering if some chip was starting to be defective and if a CPU/NEO-B1/LSPC2 benchmark was possible, to compare with a normal board.

jwestfall69 commented 3 years ago

It wont be possible to benchmark the NEO-B1 or LSPC2. It maybe possible to add some type of benchmark for the cpu/68K.

Your problem does sound like a clock or NEO-D0 issue. You might try hitting up one of the tech support forums at

https://www.arcade-projects.com/forums/index.php?board/31-neo-geo-mvs-and-aes/

and/or

http://www.neo-geo.com/forums/forumdisplay.php?14-Neo-Geo-Tech-Support

to see if anyone else has any ideas on the cause.

Ryoandr commented 3 years ago

Ok so it kinda fixed itself ?? I tried various replacements, D0, and numerous LSPC2, in the end I went back to the og LSPC2 and no more slowdowns for some reason.... I still have that wierd sync problem.