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Voodoo 2 TMU or FBI problem?

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First post, by kennymccain

Posted on 
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Dear fellow Vogon users,

I have two Voodoo 2 cards with problems of there own. One is not recognised in Windows and the 3dfx tools report the card as faulty. It needs some TLC to get fixed again.

But the other card is the problem right now. First off al it installs just fine in Windows. Games start without problems only the textures look a bit weird. [https://tweakers.net/i/b3yi3zSnvPS9mxow ... user_large]

I straitend out all the pins of the TMU'S and the FBI chip and I checked if they still make contact with the pads. Next thing on the list is checking all the traces...

The 3dfx tools also gives no errors on this card, so imo it should be a faulty connection.

My question to you guys is what you think the problem could be?

Reply 1 of 2, by Imperious

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Unfortunately no errors in Mojo doesn't mean all is well. My Voodoo 1 had 1 bad ram chip connected to the FBI but Mojo said 2MB was there.
Maybe You have a bad memory IC connected to the TMU. Worse case scenario You have a bad TMU.

You can try with autoexec.bat variables disabling some of the ram or even 1 or both TMU's as a means of diagnosis.

SST_TEXMAP_DISABLE
SST_FBIMEM_SIZE=
SST_TMUMEM_SIZE=

https://patrizio1.tripod.com/var.htm

Atari 2600, TI994a, Vic20, c64, ZX Spectrum 128, Amstrad CPC464, Atari 65XE, Commodore Plus/4, Amiga 500
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Reply 2 of 2, by kennymccain

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Thanx for the advice, I'll try to edit the autoexec.bat to narrow it down to wich TMU it relates.

I'm also trying a multimeter to see of there is any continuïteit between the memory and the TMU's.

Hopefully I can find the cause, and hopefully its not a bad TMU. Memory is far easyer to replace.

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