maybe something here:
Voodoo 2 component map

Seen that. There's no STB and its layout is very different from standard Voodoo. From those diagams they can possibly be 1nf, 100nf or 150 nf, but which I can't discern.

Slesar wrote on 2023-03-25, 22:58:

Seen that. There's no STB and its layout is very different from standard Voodoo. From those diagams they can possibly be 1nf, 100nf or 150 nf, but which I can't discern.

I have two of these cards, but how do I determine the capacity? I don't see any markings on them. Also, which 12MB version do you have? One has memory on the backside (Made in Mexico, from what I have seen), and the other has no memory (Made in Taiwan). I have the 12MB version with no memory on the backside.

Meatball wrote on 2023-03-25, 23:49:

I have two of these cards, but how do I determine the capacity? I don't see any markings on them. Also, which 12MB version do you have?

That's the problem - you can't determine it if you don't know. When trying to measure it in-circuit the capacitance of connected p-n junctions of active elements inerferes. You can measure relatively big capacitors that way, but not nanofarad size in which case said interference leads to completely irrelevant results. The correct way would be to desolder the caps in question from a working board and then to measure, but I don't want to risk my only working STB (those add much less interference to the picture than any other Voodoo I know). The only indication of capacitance 0603 smd's have is that nanofarad size are usually beige, picofarad - somewhat lighter beige.
My Voodoo is Taiwan born in 1999, one-sided 100MHz Mosel-Vitelic revC board marked "2". The working one is also Taiwan 1999 revC marked "2", but 90 MHz (those cheap bastards 😀), which makes me wonder - will they work in SLI at all or not?

Slesar wrote on 2023-03-26, 01:56:

Meatball wrote on 2023-03-25, 23:49:

I have two of these cards, but how do I determine the capacity? I don't see any markings on them. Also, which 12MB version do you have?

That's the problem - you can't determine it if you don't know. When trying to measure it in-circuit the capacitance of connected p-n junctions of active elements inerferes. You can measure relatively big capacitors that way, but not nanofarad size in which case said interference leads to completely irrelevant results. The correct way would be to desolder the caps in question from a working board and then to measure, but I don't want to risk my only working STB (those add much less interference to the picture than any other Voodoo I know). The only indication of capacitance 0603 smd's have is that nanofarad size are usually beige, picofarad - somewhat lighter beige.
My Voodoo is Taiwan born in 1999, one-sided 100MHz Mosel-Vitelic revC board marked "2". The working one is also Taiwan 1999 revC marked "2", but 90 MHz (those cheap bastards 😀), which makes me wonder - will they work in SLI at all or not?

There shouldn't be any issues; at worst you might have trouble overclocking one as hard as the other, but I doubt you'd push them that hard in 2023. Worst case is use the FastVoodoo Driver for mismatched SLI, but again, I doubt SLI will be an issue.

Meatball wrote on 2023-03-26, 02:01:

Worst case is use the FastVoodoo Driver for mismatched SLI, but again, I doubt SLI will be an issue.

Thanks, good to hear that. The only problem left - how to revive the second one, for which a layout diagram would be nice (looking at the other thread it would help more people than just me) or at least values for the caps in question.

have you actually tested it? i thought i've read that if they're simply decoupling caps, the card may still work albeit with possibly more interference.

there are codes for SMCs, could help if theres any text on em - https://www.digikey.com/en/resources/conversi … -capacitor-code

also i saw 12 mb and assumed it was a voodoo2 🙁

STB Blackmagic IS Voodoo 2 - don't know if STB manufactured any of original Voodoo Graphics ever, especially in 1999, also if it is physically possible to outfit a Voodoo Graphics with 12Mb RAM. The caps are 0603 beige ceramics smd's - there is no text on them. I hoped someone'd have an STB with busted chips, maybe, and could measure those values without risking valuable hardware. If the caps are 100nf, they're, indeed, decoupling, but they could be 1nf or 150nf and what do those do is a mystery to me.

Correction: 100nf are bypass not decoupling. My bad 😀. And without decoupling caps the circuit would be broken anyway.

wording was a bit unclear.... Yep 6 mb is the most VRAM you'd find on a stock v1, some have put 8mb on it (e.g. https://www.youtube.com/watch?v=I4rIDNDQUpU)

my repair example: diags on voodoo2 only showed 1 TMU. After very close inspection I found a missing cap and resistor on the back side; someone must have been careless and threw the card around because it was clear the components were torn from the pad. Scavenged a resistor from a random cdrom controller board and now it works fine, even with the missing cap. 🤷

drosse1meyer wrote on 2023-03-26, 16:19:

wording was a bit unclear.... Yep 6 mb is the most VRAM you'd find on a stock v1

There are stock 8MB Voodoo Graphics cards.😎
http://www.tdfx.de/ger/macmagic.shtml
http://tdfx.de/ger/magic3d_plus.shtml

Doornkaat wrote on 2023-03-26, 20:44:

There are stock 8MB Voodoo Graphics cards.😎 http://www.tdfx.de/ger/macmagic.shtml http://tdfx.de/ger/magic3d_plus.shtml […]
Show full quote

drosse1meyer wrote on 2023-03-26, 16:19:

wording was a bit unclear.... Yep 6 mb is the most VRAM you'd find on a stock v1

There are stock 8MB Voodoo Graphics cards.😎
http://www.tdfx.de/ger/macmagic.shtml
http://tdfx.de/ger/magic3d_plus.shtml

thats pretty cool. i like the one with the green heatsinks