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    Found the 50MHz bus switch on Alchemy (5400/6400)

    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...
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    Found the 50MHz bus switch on Alchemy (5400/6400)

    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...
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    Found the 50MHz bus switch on Alchemy (5400/6400)

    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...
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    Radeon 7000 Flashing problems

    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.
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    Shaphire Radeon 7000 issue

    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...
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    A friendly reminder that MacTCP performance is godawful - OpenTransport is nearly 3x faster

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

    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/
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    ANS 500 Rom

    Physically, the ROM module is 4 MB.
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    ROM hacking in the 68040 Macs

    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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    Schematics for Power Mac 7600?

    Deleted...
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    Schematics for Power Mac 7600?

    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...
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    iMac G4 OS9 and iPod

    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...
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    WTB/WTT: Umax SuperMac c600

    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.
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    PPC750GX vs. PPC750GL?

    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...
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    Wiring my computer room for localtalk - topology?

    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...
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    CPU swap PPC604e

    non-Kansas CPU slot pinout: https://sphinxgroup.org/Apple_pinouts/CPU_Slot_Pinout Note this is only the upper row of 146 distinct pins. The lower row is, IIRC, a long set of GND with some voltage on hte little separated segment. I found some notes. The long continuous segment at the...
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    CPU swap PPC604e

    edit time limit expired so additional post... Did you change the CLKID pins on the card? They need to be adjusted if you're moving outside the 45 MHz - 50 MHz realm. If you look at the third image in your first posting. IMG_1521.png and zoom in on the edge connector, you'll see that pins...
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    CPU swap PPC604e

    Did you change the CLKID pins on the card? They need to be adjusted if you're moving outside the 45 MHz - 50 MHz realm.
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    Three Slot Riser for 6400 - In search of the Mythical Slot C

    First, I'm quite enjoying the progress you gentlemen are making on this project. Second, the idea above is one I quite liked when I was considering adding back the 3 lower Bandit PCI slots to the Umax S900/J700. The secondary CPU slot on both logic boards has (almost) all the connections...
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    Apple Color Plus 14" Display repair

    You can replace it with the same value fuse as is already there, but replace it with a "slow blow" fuse, not a quick (fast?) blow fuse. I also recommend installing a fuse holder in case you must revisit the issue. As to the underlying cause, there was a claim about the cause, way back when...
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