Schematic here Re: Voodoo2 component map

Thank you! That helped a lot. After connecting a few broken vias and traces, replacing a few rams, etc. Now the Voodoo passes the whole witchery test.

HOWEVER it still shows dead TMUs and no FBI RAM in Mojo. Task manager shows Voodoo 2 driver working correctly, but display menu locks up when trying to start it.

Is there somebody more experienced with the architecture of these cards that can tell me why Witchery passes all the tests (including communication between FBI and TMU 0) yet mojo doesn't even recognise the FBI ram? It shows it as 0 MB

Glad it helped.

Mojo is pretty useless as a diagnostics, as it will show things like 0 FBI RAM even if the FBI RAM is OK but the issue is TMU related.

If witchery passes all tests, you should look into the TMU0/1 RAM (current witchery does not support TMU RAM testing).

I think there was another tool that supported TMU RAM testing, it was mentioned on this forum before.

Edit: it's mentioned here Re: Voodoo2 diagnostics software (Witchery)

Very useful topic also for me. 😀

Thank you! I tried it (took me a bit to figure out which parameters to add to make it run from a drive instead of CD), but sadly it just stops on "Processing loop 1". Doesn't show anything beyond that. Did it ever happen to somebody? It always stops on this line, no matter if I only want to test connection, tmu 0 or tmu 1. System otherwise responds and I am able to cancel out of the script.

Update: In the fit of midnight rage, I just decided to replace TMU0 ram altogether - now the TMU testing reports further information. It shows correct amount of RAM for FBI and TMO0, but half the ram for TMU1.

It proceeds to "warm up" the chip and then immediately reports "illegal operation" and ends. What could be causing it? It does the same thing no matter if I run control lines test, address test, tmu0, tmu1, etc.
As far as Voodoo output goes, it just goes from passthrough to black (still in sync with the screen) as soon as the test starts.

Thank you so much! 😀

UPDATE: Fixed 😀 I changed the rest of the RAM for TMU 1 and now the card is running UT99 like a champ. Just have to solve the occasional graphical glitches - seems like maybe one of the new chips or one address line is not quite up to snuff. 😀

The "illegal operation" error was caused by me trying to run it on a non-SSE Celeron. The minimum requirements for V2-Tmu-Tester are a Pentium 3 based system (with SSE). 😀

Done, card fully fixed! It was one stubborn address line having a broken via or trace under the SLI connector. 😁 And, while at it, I also added the full amount of ram. 😀 Thank you so much for your help!