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Yeah, it'd be a different kind of project of course. Good luck with it!

I get that, but I'm wondering if it's more work to figure out how they did than to just make a new driver that acts as a serial port. Assuming that you'd be making new hardware anyway.

Isn't ADB completely documented? Would it be substantially less work to do that from nothing? I assume you want to reuse their drivers, but are they really that much work?

Always wondered about this one. Isn't ADB extremely slow?

Here is some information on the custom chips: http://www.dosdays.co.uk/topics/retro_review_pas16_pt1.php

The optocoupler is used for the MIDI input.

Have you tried following the traces backwards from the jacks? It'll go through at least some passives, maybe the opamps. Either it goes through the custom IC or directly to the port.

I'm counting 5 quad op amps (LF347) in the half of the board closest to the output, so I strongly doubt it's sending all-digital signals to the Patch Panel. There's also the Yamaha YMF chip, which is a synth IC, and it's companion DAC, the YAC512, so there is definitely something analogue...

Can the computer tell if the box is connected or not? I'd put a scope on it to see what the computer is sending to the box. The MIDI lines, for instance, are bound to be more or less straight through and easily identified. As for the audio, one technique that was common in musical instruments...

I put a Noctua in the PSU in mine and found it did make quite a bit of difference. I also replaced the CPU fan, but I don't remember with what. As far as I remember it was hard to find something that fit. All in all it's quite a bit better now, but not perfect.

I've made a couple of boards with QFPs and I'm not sure I will again unless forced. I had access to a fairly good setup with an oven and used stencils, and every time I populated one it was 5 minutes in the oven, then hours of sweating, shouting and self-loathing as I tried to clean up all the...

Amazing work! Fingers crossed :) The LC was our first family computer. I wonder where I'd been without it.

I don't have OS 8 on anything. My 7100 (my best Mac friend at the moment) is on 7.6.1, mostly for the look, and my Lombards and Sawteeth are on 9.2.2. Is it really significantly heavier than, say, 8.6? I feel like very few things were taken away in those last few years, not in the same way that...

I don't have any input except that if it's not temperature-related, it could be an error in the soft power circuitry. There's some sort of relay in there, and possibly a flip-flop that controls it. Mostly I'd just like to thank you for documenting your troubleshooting. It's very useful to have...

I bought a 5m S-video cable with the naive expectation that it would be possible to put my 7100 in a cupboard. Unfortunately, it doesn't seem to work. Sometimes I can get the keyboard to turn the machine on, but it doesn't work after boot-up. I am running an Extended II, teardrop mouse, and a...

Not sure if this helps at all, but all the simple passive MIDI interfaces work like this. MIDI is a serial port at 31.25KHz, which the Mac can't do natively, so to do MIDI you need a breakout box that supplies a 1MHz clock. I have schematics for something like this somewhere but my Macs aren't...

Yeah. "The worst one", I think. It came stock with a 601 as the only PPC machine, but can be upgraded as I remember.

Well, they're undesirable unless you happen to have a Nubus card you want to use, or are just interested in this (brief, transitional) period of Apple's history. I paid 200 euros for a 7100 off eBay for a project (vintage ProTools music setup) just a few months ago and I'm very happy with it...

Isn't a daisy chain when devices have an in and out and you connect one to the other? In SCSI all devices are connected in parallel, even on external cases that have two ports, they're just paralleled together. I think that's what's meant by a Y-cable.

https://macintoshgarden.org/apps/psimac-10 Have you looked at the contents of the second archive in this link? Not sure what "other Psion Mac software" covers.