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CRIKEY

Sounds like a PERQ all right, especially if it was summertime and a space heater was not required. Unfortunately I've never troubled MAME for very much (the in-browser emulator for software on archive.org is about it), so I'm afraid I can't offer any help! Hopefully someone else knows...

I love messing around with early graphical environments. I have a couple UK-centric ones in my "lab", in fact: the window management system in PERQ PNX, and Oriel as developed on machines made by Whitechapel Computer Works, both circa 1984 or so. These are similarly uninspiring from a UX...

I'm mainly a Lisa person, but the connection to vintage Macs is so strong that it makes sense to hang out here. People talk about Lisa stuff here all the time --- also Apple 2 stuff and even other platforms now and then. But that aside, what's one thing that people talk about more than just...

This would probably involve an unexpected demonstration that P=NP or perhaps of some other mildly notable result in complexity theory. In which case you have, all of a sudden, a few new preoccupations that extend just the slightest bit beyond using an obsolete computer to obtain bitcoin. Among...

OK, seems very likely not the computer then, no need to check for hot components on the logic board. (And finger-checking for hot items inside a PSU is a pretty bad idea, not that you were considering doing that!) Good luck fixing the PSU, the problem seems like it must be there.

If it's right off the PSU and you have a good connection, then I would not hold out much hope for higher voltages on the board. Still, it's worth checking just in case there's something we've missed. Since you have an original PSU, is it worth seeing whether the IIGS will boot with that instead...

I know very little specific about IIGSes, but +4.5V is still out-of-spec low for plenty of ordinary +5V logic; take this 74LS374 datasheet for example. +4.75V is the minimum listed. Or, to go with some ICs found in the IIGS: 65C816: +4.75V when running in a +5V system (PDF page 25, very top of...

It doesn't though --- literally all crypto is most assuredly not for me.

Crypto is most assuredly not for me, but I respect the dedication and thoroughness. A few questions: what is Mac OS 6.8 (do you mean 6.0.8), and what is the screenshot from? (It's not from the Mac Plus that you mention, that's for certain.) I think some qualification of "slowest Bitcoin miner...

I remember as a kid applying a treatment like this to the DC motors in some of my model train locomotives, although I was probably a bit less gentle about scraping off the commutator than OP was. I found there was a temporary benefit but that it didn't last long. I'd be interested to know how...

I found this old comment of mine over on LisaList2: it might have what you need. Assumes Linux/OSX/similar and a computer with a serial port.

Sorry for forgetting the evolution of this system! Yes, run that version. A memory of something fun during those lockdown months.

This is a nice-looking 2/10. Congrats on the working Widget; it is a rarity. I am responsible for carrying out the Widget "science" that @cheesestraws mentioned, and aside from a bit of troubleshooting a few years ago (indicating a problem talking to one of the heads on one of the drives), I...

Hi @Cashed , I think we are having a hard time understanding what you're trying to accomplish and how you're trying to accomplish it. This is not the first time we've had a discussion about your intentions, so I wonder if we might want to seek other methods of satisfying our curiosity than with...

Apologies for missing the second photo. If there's really arcing coming out of that hole, then yes, that flyback is probably best understood to be toast. Good luck in your repairs!

Assuming the "hole" is the place circled in red in the initial photo, how does a short emerge from a part of the flyback where there are no wires? A new flyback may be called for, and there may be a short somewhere, and there certainly appears to be arcing, but I think the story has to be a...

Is the red circled area where the arcing is taking place? Are you certain that it's not supposed to look like that? I don't know that there are any wires in the place you've circled; I think they're all in the cylindrical part, and the thick square-sided loop is the transformer core (inside of...

I maintain that just about any exposure of a classic Mac case to acetone is a bad idea. The only exception I can think of is when you wish to use acetone to weld together two pieces of a broken housing. This is an effective repair technique (when used skillfully) because acetone melts ABS...

I am fairly certain that it is a terrible idea to immerse most computer cases in a bath of acetone, which is an effective solvent for the ABS plastic that makes up the housings of many of the Macs that this forum discusses. Apple 2 cases have a variety of plastics and (in some cases) finishes...