joevt's latest activity
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.When you are able to boot into Open Firmware, you can use the script at...
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Jjoevt replied to the thread MFM Floppy Drives?.Coincidentally, the Power Mac 4400 schematics do have a U44 connected to MFM. The 4400 uses OHare as the mac-io controller. I suppose...
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Jjoevt replied to the thread MFM Floppy Drives?.U44 is not mentioned in the Beige G3 schematics. https://www.macdat.net/repair/apple_schematics.html The schematics do have the GCR...
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Jjoevt replied to the thread MFM Floppy Drives?.Might need to set some feature control bits. https://68kmla.org/bb/threads/beige-g3-ram-and-psu-questions.52027/post-587215
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Jjoevt replied to the thread Macintosh Portable & Powerbook 100 power adapter bench.Your graph doesn't show the voltage reaching zero. How high of a current (lowering of resistance) did you try for each power supply...
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Jjoevt replied to the thread Happy 50th Anniversary Apple.Add Apple II graphics using the Apple I expansion slot?
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Jjoevt replied to the thread MARCHintosh 2026 Projects.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...
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Jjoevt replied to the thread ThinkC digesting MIDI in with C on 68k macs - video.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...
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.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...
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Jjoevt replied to the thread PCI Riser Design Rework of GitHub PCIe Riser - Howto?.Mac Schematics at https://www.macdat.net/repair/apple_schematics.html
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Jjoevt replied to the thread Apple Network Server MacOS based ROMs found.I used kansas_deinterleave to deinterleave all the ROMs. I think most people just want ANS 2.0. This four chip arrangement is not...
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Jjoevt replied to the thread ThinkC digesting MIDI in with C on 68k macs - video.The picture at https://tinkerdifferent.com/threads/marchintosh-2026-projects.5092/post-45965 shows 33% and 66% gray pattern with the...
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Jjoevt replied to the thread MARCHintosh 2026 Projects.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...
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Jjoevt replied to the thread PCI Riser Design Rework of GitHub PCIe Riser - Howto?.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...