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I was under the impression that the 3.6v stuff didn’t work on the Plus, which requires 4.5v?

I was under the impression that the speed of the CPU was controlled separately on the IIsi by its own clock chip? (I mean, I figured the PDS slot might be an issue, but the rest of the computer I assumed was uneffected.) Do you know what other stuff is controlled by and/or messed up by the CPU...

I was reading a thread about 68882 counterfeiting and was wondering if similar things happen with 68030 chips? (I would assume yes.) I got a couple 33MHz rated 68030s on eBay for like $7 each thinking I could replace the CPU on my IIsi and "overclock" it to at least the rated speed of the chip...

Do you have other ram to try? Or can you try the existing ram in pairs? (2MB at a time?)

Nice

Is that… a serial port hard drive? That’s pretty neat.

Finished with it this morning; the IIsi is now in fully working order!

Crap that’s exactly what I did. *facepalm* Thank you.

IIsi has visibly swollen capacitors so I ordered some replacements. I got the little square tantalum ones because I read they don’t leak. I double checked the markings and supposedly they are 47uf 16v, which should match what’s on the board. https://a.co/d/6pa0oPv Installed the first one...

So, I have one of these with the Mitsumi switches, and it had ten dead keys. I was able to do the “take it apart and bend the spring back” on seven of the ten, but the other three continued to have intermittent or nonexistent contact. Unfortunately it was an Apple-specific part. Salvaged and...

I'm curious about the little metal square over the read/write heads. What is that for? (Visible in this photo: link - the left drive has its "hat" and the right one does not.) I figured they were dust protection or something but I have a drive with one missing, and if I install it in its proper...

Did you check for shorts in the DB/AB connectors? When I recapped one of mine recently I reflowed the connections, as one does. But my soldering-noob-self accidentally made bridged composite video signal to ground. Careless. But it gave me a black screen and other symptoms were very similar to...

A bent/unbent pin or two shouldn't be a big deal. If the ROM chips were bad I don't think you'd even get the sad mac. Contacts can look fine and still have some scum on them causing problems. (I don't know why but dust seems to trap grease in certain environments and create a sort of slime...

Yup, I googled TO-3 and that's exactly what I was talking about. Thank you for the link. I emailed DigiKey's customer service line and they also recommended the Central Semiconductor 2N6714. https://www.digikey.com/en/products/detail/central-semiconductor-corp/2N6714-TIN-LEAD/13663177 So I...

If the 5v line from the PSU is only outputting 4.1v you might want to start with recapping the PSU instead.

I recently recapped two Plusses and had similar issues; for whatever reason(s) I needed to spray contact cleaner on the ram sockets and clean the contacts on the SIMMs for both of them before they’d work reliably again, despite not having touched the RAM. Was weird. I just chalked it up to...

This.

Depending on the car, a new radiator fan might not be very expensive. FWIW. Salvage yards FTW. Check out car-part.com.

I had a similar issue with one; turned out the jack on the keyboard was making intermittent contact. Worked when I tested it at the angle that was convenient to my multimeter but, not flat on the desk. *facepalm*

So I emailed the ZuluSCSI seller, (who responds to emails way too fast. I think they might not sleep?) and it turns out the Plus is very picky about what drivers you use to initialize the hard drive image. I just happened to be using a premade image on the BlueSCSI that was ok. The default...