Search results

I left the machine soaking and I soon noted how hot the PSU runs. There's no built-in fan like its IIcx/ci/etc cousins. That must contribute to the IIsi's poor survival rate and lead to these bad goo explosions.

I got the daughter board out again and took off the regulator chip: Gag. Loads of goo and solder mask eaten through to a ground trace. That was pulling pin 7 down to about 0.2v and resulting in the regulation always being enabled. Pin7 is pulled up to +5v by a 100k resistor so the electrolyte...

Yikes, I'm surprised goo had got to the back end of your machine. Mine had goo fromt the low-voltage side oozing out towards of the front end. Luckily, it hadn't reached the logic board. I gave the main PSU board a good IPA bath but sadly that didn't help (though it looks much better now). I...

Thanks. With a relay and transformers to worry about, I too am thinking about a very shallow, barely-covered bath.

I too have hit this soft power issue. I picked up a IIsi for which the logic board was mostly fine although needing a recap. The PSU was a disaster, however: trickle supply was OK but nothing else. Cap goo was everywhere. The main HV caps were fine but I replaced the rest. Here's one example of...

Get top-3.3 from https://www.aux-penelope.com/jagubox/ .. it's fine.

Another datapoint here: I have a IIci with ROMinator II (which is based on the IIsi ROM) that won't launch A/UX 3.1, but it's perfectlyhappy with the stock ROM. I've never bothered to debug this, but I suspect it may be related to the RAM configuration.

So, my Pismo battery was a third party replacement I'd got back in 2003! It now managed to hold charge for perhaps only 10 minutes .. so I needed to do something. On eBay, I picked up some dead batteries for a few backs each so that I could play around taking cracked opne. I got 2 Apple branded...

Bomarc schematics here: https://github.com/nickpunt/nubus-se30/blob/master/Schematics/bomarc/Macintosh%20LC%20III%20Schematic%20(bomarc).pdf

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?