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Open Firmware has a weird input behaviour for serial on Old World Macs (and telnet on New World Macs). Maybe it affects keyboard input as well. If you paste more than 14 characters at a time, it will throw away characters. I haven't traced the execution path that causes this. It would be pretty...

I think the point of the discussion was that you don't need to do anything special to support PowerPC stuff if you focus on only supporting the built-in SCC. USB serial port adapters would need more work if they support MIDI. For printer port support, does your software fail gracefully if the...

I meant when Apple stopped including a way to use a 85C30 compatible SCC (Zilog, AMD, etc). With the iMac, B&W G3, and some G4s, you can connect an adapter (GeeThree Stealth Serial Port, Griffin gPort, Jamport, etc.) to the modem port on the motherboard that allows a connection to the SCC that...

https://snowemu.com

I don't think doing Gestalt will be necessary unless you can find a difference between 68K and PPC SCC. You can probably just assume there's an SCC if you can open the driver as you do. Check the SccRd and SccWr values to make sure they're not weird (null or inside RAM). Mac I/O controllers...

I don't think the SCC has changed. Are you using modem or printer port? For printer port, you have these addresses: 0x1E4 0x1E8. Where did you get those values from? Both modem and printer port are supposed to be accessed using SccRd and SccWr at 0x1D8 and 0x1DC. These are listed in LowMem.h...

The .cue says FILE "Bandit 18" BINARY. It doesn't work if the "Bandit 18" file doesn't have a .bin extension?

There's a .cue file which says that the corresponding binary file is a single track CD with block size 2352. Just convert it to 2048 byte sized blocks. Each CD blocks begins with a 16 byte header (like this: 00ff ffff ffff ffff ffff ff00 0002 0001 and ends with 2352-16-2048=288 byte footer...

Regarding the forum emoji problem, you can surround the text with and [ /icode] or and : repo:Mu0n/1bitdreammachine path:/^cozyMIDI\// symbol:PreProcessEvents repo:Mu0n/1bitdreammachine path:/^cozyMIDI\// symbol:PreProcessEvents Regarding the GitHub search problem: Maybe the repository...

Config Block Editor has ROM flashing capability?

Notes about RAM timings affecting detection of 3 or 4 DIMMs: https://forums.macrumors.com/threads/power-mac-g4-mdd-fw800-1-25ghz-uni-upgrade-advice-ram-gpu-cpu-pci-sata-usb-pci-to-pcie-experiments.2484127/post-34641895

Did you try to open a file? Config Block Editor can open files with creator of cbif and type brom or ROM . These can be a 1MiB firmware dump. You should get a firmware dump before and after modifying so you can compare before and after. It can open individual config blocks with type:creator of...

M5120 and M5126 are two models of Macintosh portable where the latter is backlit and the former is not. Ribbon cable and flat flex are two different types of cabling. What kind of cabling are you going to use? What is U4 going to be? It looks like you made the decision to switch to flat flex at...

My Power Mac 8600/200 is also J38. My Power Mac 8600/200 does not have either BoxID bits tied to the centre pin (/BoxPD). In the 9600 schematic, BoxID(1) and BoxID(0) are hard coded as 01 (a pull-down and a pull-up resister). The 9600 schematic shows /BoxPD is not connected to anything - the...

It may be possible to just remove sixty6 from the device tree to ensure that it's driver is not loaded and that you get the full 4 MB of VRAM for the main RGB video output. In Open Firmware, set use-nvramrc? true Then add the following to nvramrc: dev pci1/gc/sixty6 " sixty6-disabled"...

FF7F means there's a connection to the composite video output. This needs to be fixed. I don't have Power Mac 7500/8500/8600 schematics but here you can find Power Mac 9500 schematics: https://www.macdat.net/repair/apple_schematics.html From GrandCentral on sheet 15, there's a pin 172 DEV5CS...

Move it to the trash and restart? Moving folders to the trash does not affect files that are already open. When you restart, the files might not get opened (unless they are opened by file ID instead of file path). If you install MacsBug, I think it has a command to list open files? When...

Right. The display in the photo cannot be the display connected to this graphics card. The display is just grey checkerboard.

The memory dump shows the framebuffer at offset 0 which has a B&W checkerboard pattern that is 128 bytes wide = 1024 pixels, 769 lines. The decldata is 4K at offset 0x30000 (192K) The decldata uses 2 of the 4 byte lanes so its actual data is 2K. The decldata repeats 16 times until offset 256K...

The zip opens on modern macOS, then you transfer it to your old Mac.