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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?

Use the tbxi dump command to extract all the parts of the ROM. https://github.com/elliotnunn/tbxi We could load the special ROM from disk and use virtual memory to map it in place. We would need to understand what kind of virtual memory stuff happens during boot to see if that's possible (i.e...

Looks great. White keys with no black keys or with only one black key have their entire area hilited. White keys with black keys on both sides only get their bottom half hilited. I suppose that can't be helped if the black keys are only two pixels apart. I can't tell how far apart they are in...

If that's the case, then this should show DHR colors on the right hand side of the display with the corresponding HR colors to the left of that (mixed with the same DHR colors): 10 HGR : HCOLOR=7 20 HPLOT 279,0 to 279,19 30 HPLOT 278,10 to 278,19 40 HPLOT 265,0 to 265,19 50 HPLOT 264,10 to...

I plan on continuing work on my Open Firmware Extender for Open Firmware 2.4 and to make a version for Open Firmware 1.0.5 and the ANS ROM versions. If one can boot Mac OS on an ANS ROM version that is missing support for the built in graphics or the internal PCI SCSI controllers, then I think...

Right. DHR and HR may have the same width, but they start at different phases of the color clock. Because of this, for the purpose of converting HR to DHR for display in a Apple II, some monochrome data must be lost in the process. You don't need to lose monochrome data when converting to a...

I looked at https://developer.apple.com/library/archive/navigation/#section=Platforms&topic=macOS "White Text on Black Background" says to use srcBic. Not sure how that can be used for TEHandle text. "InvertedText" has source code that uses srcBic to draw text (but this example uses...

I was able to extract the archive using Stuffit Destinations.app and The Unarchiver.app on macOS Monterey. Destinations adds these extended attributes: kMDItemDownloadedDate and kMDItemWhereFroms Destinations sets the execution permission flags. Destinations sets group to staff and Unarchiver...

Some Apple display EDIDs include a panel ID. Try https://github.com/joevt/AllRez

Schematics at https://www.macdat.net/repair/apple_schematics.html https://tinkerdifferent.com/resources/macintosh-portable-5120-schematic.133/ but doesn't show the V1M hybrid module. For that there's this: https://github.com/ppieczul/macintosh-portable/releases

Yes you can use them. I meant to say you can't trust them. Usually the current rating is a minimum that the adapter can supply without damage to the adapter. It does not mean the adapter can't supply more current - at least for a short time. If the Mac can force an amount of current from the...

You're saying that Apple put current limiting features in the power adapter instead of inside the Mac. You can't use third party power adapters if that's true. You would have to test the adapter to verify how much current you can draw from it. What happens to the adapter when that current limit...

What version of Open Firmware does your iMac have? Output from dump-device-tree might be useful. https://forums.macrumors.com/threads/question-how-powerful-of-a-graphics-card-will-work-in-a-beige-power-macintosh-g3.2303689/ Looking at Open Firmware 4.1.9f1 (for a slot loading iMac G3), it...

I don't think there's such a thing as a current rating that is too high? Voltage is controlled by the AC adapter. Current is controlled by the load (the Mac). The Mac is not going to use more than it normally uses. The power supply needs to have a current rating that matches or exceeds whatever...

Service Source for the 7300 says the DIMMs must be 5V and that fast paged DIMMs also work. http://www.applerepairmanuals.com/the_manuals_are_in_here/PM7300_7500_7600_WS7350.pdf It says you can increase the memory to 512 MB. That would require eight 64 MB DIMMs. I'm pretty sure 128 MB DIMMs...

They all have different version numbers and therefore different 3 MiB checksums and different 4 MiB checksums. They all have different Open Firmware code. Rev A and Rev B are both 2.0f1 but Rev B has some updates. Rev C and Rev D are both 2.4 but Rev D has a small change. 077d.40f2.1 "Boot...

I had some more Serial Test Manager notes at https://tinkerdifferent.com/threads/new-diagnostic-tool.4593/post-39652