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FWIW, a driver can support both in a single binary, but it's basically two drivers in one. One old API, one new API. IIRC 4.3 drivers are always required to be backwards compatible (or at least, the documentation instructs you to). If you have an Apple_Driver43 partition, a 4.3-supporting...

I haven't timed it (someone else might have stats), but it's definitely noticeable. Not as much as the low latency from solid state, but it helps large programs load. SCSI is pretty complex. There's interactions between async bus communication, async drivers, and bus disconnect. I'll go first...

Yeah, I'm gonna try a Stage II. The docs claim they're wired for 20MHz operation, but I'll take a look at the board! Interesting. So maybe they really are faster, or maybe there's an interaction between the SE IV and a ZuluSCSI Blaster. There's a number of improvements in later machines that...

Interesting, so from those benchmarks, you can't really break the 10MB/s barrier on an 8100 either. I also noticed the same dip with a PowerPC card in the Quadra. The RP2040 Zulu is quite a bit faster than the SCSI2SD v6. I wonder if the card's read ahead cache makes up for lower transaction...

Continuing my SiliconExpress experimentation, I've been doing some benchmarks on my Quadra 650 board with ZuluSCSI. Read Native SCSI ZuluSCSI (RP2040)4,700KB/s SiliconExpress IV (8-bit) - 1.6.5 ZuluSCSI (RP2040)8,123KB/s SiliconExpress IV (16-bit) - 1.6.5 ZuluSCSI Wide 8,959KB/s Write...

With the right factory software, some CF cards can have their CHS values re-programmed, if you want an emulator-less experience. Unfortunately I've never had the right combo of card and software to try it myself, so I can't recommend a specific model.

Norton UnErase didn't find anything interesting on the disk image.

It seems like it's offsetting to 0x40800000 twice, even when I tell it to load at 0x0 manually. Loading it at 0x100000000 (overflowing it back to zero) works though, amusingly. add-symbol-file Quadra800ROM.elf 0x100000000

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...