Recent content by trag

I don't know. But we ought to be able to figure it out from the schematic. I don't have the attention to look right now. On the X500/X600, there is clearly an independent 33.33MHz oscillator that drives the PCI bus. Every PCI slot receives a PCI clock signal, so I would trace back from...

If you're discussing VRAM on the built-in 6500 video, I suggested a way to neatly take it to 4 MB, here: https://68kmla.org/bb/index.php?threads/schematics-for-power-mac-7600.46119/post-545005 I have not tried it, but the 6500 schematic suggests that one could simply remove the old GRAM chips...

The PowerSurge family (X500/X600) machines have 3 pins on the CPU cards which serve a similar purpose. The Bus clock chip is always on the CPU card, so the resistors that tell Hammerhead what Bus Speed to expect are also on the CPU card. The pins are CLKID[0 - 2] (pins 15 - 17 on the...

There's an incompatibility between the version of the ATI drivers that 9.2.2 loads and some version of QuickTime. I ran into it when trying to get classic OS loaded onto my MDD. There's an old thread about it around here somewhere.

I've converted dozens of the Sapphire R7000 cards and there's never been a timing problem. And yes, it is a simple serial Flash swap. Does the card output video before the OS starts to load? It almost sounds like the firmware isn't loading properly and the OS is supplying the driver. I...

The ethernet daughter card on the E-Machines Futura II cards does not work with Open Transport, unfortunately.

20 years ago, this is the place where I had .05" (1.27 mm) thickness boards made. I haven't priced anything there since then. https://www.advancedpcb.com/en-us/services/standard-pcbs/

Physically, the ROM module is 4 MB.

This looks like it may be a programmable ROM for the G3... https://www.ebay.com/itm/285255171956 Might need a chip added in the blank spot.

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Kind of a necro, but what the heck... Do you think the Samsung KM4132G512Q-10 would work for this purpose? I have a couple thousand of them... However, they're 2MB, 256K X 32 X 2, which is 2MB, not 1MB. So might be a drop in replacement if the address lines are there, or if the originals...

I'm not familiar with the particular models, but some of the iPods used a PATA ZIF 1.8" hard drive. The interface is PATA (parallel). The connector is a ribbon cable with a ZIF connector. The spinny drive is tiny. These drives were also used in the Dell Latitude D430 and D420, and some HP...

Probably not useful information, but the case for the C600 is the same as PowerComputing Corp. used for the tower version of the Power 80/100/120 -- their PM8100 clones. At this point the PCC Nubus clones are probably rarer than the C600.

I wonder if that bodge wire is there to carry extra current. It can be tough to get enough trace volume to carry good power supply current. Not really where you were going with that, but IIRC, those are these which are still available, but EOL. There are probably substitutes available...

I ran a passive star of PhoneNet in my house with zero problems. It's still in place, but I don't have anything active on it at the moment. I wired the house with 37 cat. 5 jacks all terminating in the wiring closet. To form the star, I took a 12 port cat. 5 panel and wired some of the...