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Re: Voodoo 2 SLI Issue

in Marvin \ Video
The SLI SYNC signals go to the FBI, so in no way that cable would have caused TMU related faults. Also, the memory itself is most likely fine, check the TMU pins (poke them and see if they move, also check for shorts between pins).

Re: Voodoo 2 SLI Issue

in Marvin \ Video
The 4 twisted wires are GND, SLI SYNC IN, SLI SYNC OUT, GND. Using a cable without the twist will just connect SYNC OUT to SYNC OUT and SYNC IN to SYNC IN. This really shouldn't cause any damage. Most likely the card was DOA.

Re: Noise on pass-through of a Voodoo2 card

in Marvin \ Video
The RAMDAC has nothing to do with the VGA passthrough. You can remove it completely and the passthrough will still work. Involved in the passhtrough circuitry are the VGA connectors, U10 ( QST3384/ PI5C3384C) and FB6,C36,C38 (U10 power filtering). FB6, C36, C38 values can be found here: https://www. …

Re: Whats wrong with this voodoo 2 Bad Ram or bad TMU

in Marvin \ Video
TMU0 is on the right side of the card. I fixed quite a few V2 cards, and I never found one with faulty RAM. In case of artifacts, almost always the issue was loose pins. Take a sharp tool (a needle would work fine) and gently poke all the TMU pins, see if they move. Do this for both TMUs.

Re: Voodoo 2 repair, missing legs on Chuck

in Marvin \ Video
TMU pin 128 seems to be supply voltage - did you mean 208? Weird typo on my behalf, yes, I meant pin 208. I still find it weird that the only other connection of that net seems to be pin 62 of the RAMDAC - which the datasheet describes as "Not connected – leave floating or tie to ground". Some V2 …

Re: Voodoo 2 repair, missing legs on Chuck

in Marvin \ Video
You're right, it's not directly the PCI reset signal, but it is a reset line for the TMUs. The TMUs are chained, the data from TMU1 needs to go to the FBI, but it doesn't have a direct connection, it goes through TMU0. If TMU0 is busy with other stuff, it asserts the stall signal. Same goes for the …

Re: Bare 3Dfx Voodoo 2 board pictures

in Marvin \ Video
You can figure the direction by looking at the position of the series termination resistors (10-22-47R), they are placed near the source. The best is to check on cards based on the older reference design (like CT6670), as the newer reference design is missing some, IIRC for the TMU output.

Re: Bare 3Dfx Voodoo 2 board pictures

in Marvin \ Video
The architecture is something like this: FBI: -unidrectional (output) 16 bit DDR data bus, going to both TMUs. Besides the 16 bit data bus there are also some address pins (since the TMUs are connected on the same bus) and CLK. -unidirectional (input) 16 bit DDR data bus, coming from TMU0, similar …

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