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When you are able to boot into Open Firmware, you can use the script at https://tinkerdifferent.com/threads/apple-network-server-macos-based-roms-found.4756/post-41390 to see all the checksums.

Coincidentally, the Power Mac 4400 schematics do have a U44 connected to MFM. The 4400 uses OHare as the mac-io controller. I suppose the U44 MFM controller was moved into Heathrow and Paddington and those newer chips added the MFM feature control bits?

U44 is not mentioned in the Beige G3 schematics. https://www.macdat.net/repair/apple_schematics.html The schematics do have the GCR and MFM slots. The MFM slot connects mostly directly to Heathrow so maybe U44 doesn't have anything to do with it? There's a couple resisters R340 and R341 marked...

Might need to set some feature control bits. https://68kmla.org/bb/threads/beige-g3-ram-and-psu-questions.52027/post-587215

Your graph doesn't show the voltage reaching zero. How high of a current (lowering of resistance) did you try for each power supply? Would too high a current have voltage reach zero or would it damage the power supply? Is there a way to make the 2.0A power supplies have a similar curve as the...

Add Apple II graphics using the Apple I expansion slot?

So Linux already has a FireWire Target Disk Mode capability. Open Firmware appears to have code to scan a range of LUNs, but for some reason the range is set to [0]. Maybe Apple had a good reason, like it wasn't fully implemented (LUN in a device path doesn't work?), or multiple LUNs might...

Looks good. I think it can be improved by changing the alignment of the pattern so that each white key is drawn with the same alignment relative to the position of the key. With the current alignment (relative to the window position), you see that the appearance of hilited white keys repeats...

Yes. That's the only one with 1 MiB files. Any reason to not connect them? Code for flashing various chips exists in New World Mac firmware updaters (Open Firmware code), and in open source utilities such as flashrom. I have a fork of flashrom for Mac OS X. I'll read those later. I was...

Mac Schematics at https://www.macdat.net/repair/apple_schematics.html

I used kansas_deinterleave to deinterleave all the ROMs. I think most people just want ANS 2.0. This four chip arrangement is not flashable by Apple's flash utility which expects different chips. Also, your ROM DIMMs won't have the write enable pin wired so we can't make our own flash utility?

The picture at https://tinkerdifferent.com/threads/marchintosh-2026-projects.5092/post-45965 shows 33% and 66% gray pattern with the usual 50% pattern. There's also some different lighter patterns in the ground and the bus stop sign. Looks great. For some reason I had to download the movie to...

The FireWire mass storage device that the Mac in FireWire Target Disk Mode is pretending to be should have a LUN for each disk (block device) in the Mac (only the block devices that are usable by Open Firmware).

M.2 is 0.5 mm. mPCIe is 0.8 mm. PCIe is 1.0 mm. PCI is 1.27 mm (0.5 inch). ISA is 2.54 mm (0.1 inch). So make sure you choose the correct setting. I've never tried Kicad. Googled "using kicad for pcbway". Found some videos. There's a Kicad plugin for PCBWay. There's a PCBWay blog post with some...

What's an AI file or an AI schematic? Adobe Illustrator? (not related to artificial intelligence) Still not sure why the thread title mentions PCIe. Is it just because the GitHub describing the PCIe riser is the only PCB design example (or the first) that you could find? PCIe and PCI slots and...

You are saying the four PCI Risers are not based upon PCI? You mean they don't connect to a PCI slot? What do they connect to? The physical form of the connection (PCI slot or otherwise) doesn't matter as long as it has all the PCI signals. Or do you mean you have four PCI risers. And you also...

Linux has FireWire networking. It should allow connecting Linux and macOS machines? I haven't tried it. A Mac in FireWire Target Disk Mode should look like a FireWire mass storage device to Linux? A Linux machine in FireWire Target Disk Mode: If there's no existing Linux code for creating a...

Serial ports: https://forums.macrumors.com/threads/anyone-have-one-of-the-fruit-colored-imacs.2428418/post-33223598 https://forums.macrumors.com/threads/question-how-powerful-of-a-graphics-card-will-work-in-a-beige-power-macintosh-g3.2303689/post-31629573 I think there's some info on 68kMLA as...

I wonder if a dark gray pattern would be better for the black keys instead of the 50% gray pattern? Conversely, maybe a light gray pattern would be better for the white keys? Maybe those patterns would be too dark or too light? Or maybe they might have a phase problem that makes different keys...

Add a serial port adapter and try to get into the Serial Test Manager?