Recent content by eharmon

This is great! I was giving this a try today and newer gdb doesn't seem to like it...am I just doing it wrong? The target architecture is set to "m68k". ⚠️ warning: BFD: warning: Quadra800ROM.elf has a section extending past end of file Reading symbols from Quadra800ROM.elf... ⚠️ warning...

It's very low level and pretty difficult to use. That's exactly why I was interested in it (well, that and I'd really like to find out what's wrong with my on-board ethernet and the SONIC self-tests should help). I wanted to replicate this with QEMU for easier local experimentation and it turns...

Welp, I still haven't gotten the overrides to enter diagnostic mode to work quite right...scratching my head still. But I can tell you how to get into serial diagnostics on newer machines with no fuss, tested on my Wombat: Put a moderate amount of RAM in the system so the memory check takes at...

That should be PRAM at offset 0078 OR 00F8 set to "SCBI" (0x53434249). If I reboot with this set the machine resets its PRAM, so it appears to be taking the correct code path. Setting it to something like 0x11111111 it just ignores. So I took the external SCSI connector and jumped: 2 -> 14 3...

Okay, made some progress reverse engineering from these clues and the 53c96 data sheet.. I haven't tried this on a real machine yet, but I believe for machines without an edge connector, the following should work, approximately: Connect a serial cable and configure 19200 baud. PRAM at 007800F8...

Interesting, so my hunch PA0 had been relabeled as TEST was incorrect...it's not connected at all. So for Wombat the implication is the test can only run if you have an SCC (Wombat should pass that), set a specific PRAM value, and bridge some SCSI pins? Or was the PRAM value a red herring and...

Thanks folks, I went ahead and built my own. This cable has all the wires and a bare end which is pretty handy! The colors are also correct to spec, at least mine was. https://www.amazon.com/dp/B0D415MLGV

I'm trying to see if I can get my Wombat Quadra board to enter diagnostic mode, as seen here: https://web.archive.org/web/20140921020853/https://mac68k.info/wiki/display/mac68k/Diagnostic+Mode I suspect Pin 156 on U16 (the IOSB) is PA0 for VIA1, which I would think should bring the system into...

I'm no expert at words n stuff, but this seems like 3 matching disks with A-F, G-R, and S-Z, and they can spell about as well as me so a few ones that are on the wrong disk. To list disks without FUSE you can install hfsutils from homebrew, run hmount <img file> from the terminal, then hls.

Before I go buy the parts and make one, has anyone bought a working Mini-DIN to standard serial cable (preferably DB9) recently? You can, surprisingly, still buy cables, but the reviews online warn about missing wires so I am dubious.

It definitely has to be formatted with OS 9 drivers, at least.You'll see 10 or so partitions on the disk if so. That said, it's possible the later mini needs a different patch. But I doubt it, since the G5s are the same.

Three additional interesting things of note: I suspect the miroPRISMA 1152GX is also the same card. I've never seen one, but it runs basically the same ROM @ version 2.01. It follows the larger list of resolutions in the Radius card. The last miro software, last QuickColor, and the last 24AC...

I think it's hard to do much better, yeah. It's already interleaving and I don't think memory of the era ever really went below 50ns? I'm out of my depth, but maybe with a custom quad-interleave memory controller it could keep up? Multi-channel wouldn't be period, that's too late. I don't know...

Yeah, it makes everything surprisingly clean and tidy. Repeating from above since it was sandwiched in the middle of a long block; with these nvram changes: - OS 9 drive firmware should be installable from Disk Utility - OS 9 should be pickable in the OS X Startup Disk configuration - USB...

After fighting with my mini this week I realized I introduced a bug into my script above. A corrected version: #!/bin/bash echo "Setting nvramrc to allow OS 9 boot picker and USB boot..." sudo nvram nvramrc="\" /\" select-dev \" PowerMac10,1\" encode-string \" model\" property \" PowerMac10,1\"...