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Addonics ADSAIDE SATA to IDE/ATAPI Converter https://eshop.macsales.com/item/MISC/ADSAIDE/ (and other places) works really well in my B&W G3 with an OWC SSD. It's identical to the StarTech.

I'm a little confused about what firmware you've flashed on what card. Could you include pix? Note that there are 4-port cards around that aren't SeriTek but that can be flashed for use on OSX (but not OS9) which identify as SIIG-3114-101R1.

A couple of years back, I got a 64GB DOM under the brand name Hyperdisk and it was under $50 then. I have it in a Beige G3 DT where it's compact enough to plug directly into the logic board. Good performance (although an order of magnitude slower than PCI SATA) and excellent compatibility with...

Another reset option for PPC machines is "init-nvram" from OFW 2.4. I've found this breaks my (notoriously temperamental) Beige G3s out of a deep funk. This command was beacme "reset-nvram" at some point but I don't know at what OFW version.

Yeah, It does seem like a bogus error or inconsequential data corruption that has a software-induced cause. I've verified it's not an 040 caching issue by using the Cache Switch extension on my Q650 to disable caches. No difference (except slowness).

D'oh! I'll boot 7.5.5 on mine and see.

Both machines are on 7.6.1 but their volume images are different (i.e. diverged from a common 2GB origin). I could probably boot both from an external ZuluSCSI to run exactly the same image.

On my Q700, which also has a ZuluSCSI and 68MB RAM and no cards, I see no error. Here’s a screenshot: But on my Q650 - with SCSI2SD and 80MB RAM and no cards, I do see an error: This is “hc all” in both cases.

No - Q700 and Q650 are real machines. In fact, only Q800 is supported under emulation. I'm running a moderate set of extensions/control panels (listing attached). But I'm not seeing the second heap zone at all when doing an HC.

I haven't tried 6.6.3, but 6.5.3 is fine with System 7.6 on my Quadra 700, Quadra 650 and Quadra 800 emulation under QEMU. System 7.5.5 is also fine with 6.5.3 under emulation. Perhaps it's a MacsBug 6.6.3 issue?

For the currently most definitive treatise on this topic, refer to this thread over on TinkerDifferent: https://tinkerdifferent.com/threads/sata-in-an-old-world-pci-power-mac-impossibru-updated-11-22-23.1494/

I replaced a 74HC132 with: https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/74HC132D/6198924 and the corresponding 74HC74 is: https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/74HC74D/6198950 Note if you're replacing these 14SOIC packages...

See also: https://68kmla.org/bb/index.php?threads/mdd-power-supply-options.46218/post-515868

My SE30 came this way but I didn't realize it until I powered-up after re-capping and was greeted by arcing inside the tube and some very alarming buzzing sounds! I replaced the CRT and the dead driver transistor on the neck board, and all's happy now.

The ACBel PSU on my G4 failed several years ago and I tracked down and replaced the failing cap thanks to threads over at badcaps.net. Search or start here for guidance...

Homebrew is essential for all sorts of opensource dodads missing from modern MacOS. in addition to hfsutils, I use telnet, wget, qemu, minipro, minicom, jq, ... and I could go on and on. And there's Tigerbrew for PPC Macs but it's a bit of a tease to install.

In this case, the reverse-polarized tantalum draws a large current and pulls the -5V rail down (typically to around -2V). So there's not enough power for a pop, but you'll find that printer and modem ports may not work since they rely on the -5V supply.

The debate about C22 crops up from time to time. Here's a thread I started earlier this year after seing a failure: https://tinkerdifferent.com/threads/lciii-c22-polarity.2708/ The silk-screen and the original manufacture is wrong. No fault seems to occur using aluminum caps. But tantalums will...

Be aware that you've installed the infamous C22 reversed. Since you've used an aluminum cap (as per original) you shouldn't see a problem -- but if you'd used a tantalum, you'd would have. A reversed-polarized tantalum here will sink a high current and cause the -5V line to droop (or worse).