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I ended up replacing my IIsi PSU with the template board from Caymac Vintage, the “Power Up IIsi.” Works great. I only had a 90w PicoATX to use with it (250w is suggested I guess) but it works fine and powers a nubus adapter with an FPU installed. So a big thank you to Caymac is in order. Some...

Shoot, thanks! 🙏 I was going off the old Apple schematics scans. They didn’t have that. 🤓

Basically I'm trying to create a spreadsheet that catalogs which things should be reachable from what, so I can check continuity from each pin of a few core components (CPU/RAM/ROM and a few others) to 3-4 other points, and have a pretty good idea whether traces are broken or not. And then I...

Hi. So, I had a small batch of these made, using the coupons and stuff that pcbway offers new users, it was like $2 each for 10: https://www.bigmessowires.com/2023/09/27/atx-to-mac-10-pin-power-supply-adapter-kit/ I've assembled six of them so far, and they all work in my Quadra, but only one...

I had similar problems and it turned out to be a short. Grab a continuity tester and check to make sure all the adjacent pins on the stuff you soldered don’t have continuity between them. Good luck!

There’s a chip responsible for detecting ram simm size; it was called out in a recent repair video Adrian’s Digital Basement did on YouTube but I don’t remember which one it was. If you zip through his last video on the se/30 he was repairing it’s in the second half I think.

n/m

Cleaning up a bombed SE/30 and there was enough gunk on the ROM that I took it apart to clean it. (As well as ordering a new simm socket for it.) I damaged/tore one (1) solder pad on it, which is actually good for me, and I can bodge it easily enough but can’t figure out where it’s supposed to...

7.1 didn't change the behavior. I found a couple damaged pins on one of the ICs and they were in contact. Tried to bend them back but they broke off so now it doesn't even sort of work. :-( Ashes to ashes I guess. :-(

Thanks! ::grabs magnifying glass::

Three, and I tried in two of the three. In the third the card bumps into the reset switch and doesn’t set right. (It’s loooong.)

Would a problem with that interrupt indicate an issue with the hardware or more likely to be a config problem like an incorrect refresh rate or VGA adapter setting?

So I’ve got this SuperMac Thunder/24 which seems to almost work properly. It installs, boots, throws a video signal, etc. I downloaded the drivers from the Macintosh Garden and the Control Panel works with all the extra widgets and stuff. The only issue is that if the cursor goes onto the...

You might just want to trade the Sonnet for a different brand. I have a 350Mhz PowerLogix G4 card in my 7300 that has DIP switches for selectable bus speeds, etc., so I think it can be configured for, say, 60Mhz bus and 360 MHz clock. Here’s an eBay auction for one with a nice picture of the...

No, I didn't - almost every video I watched on Youtube before I set about my first attempt warned specifically against doing that. Although some of the drives have been through multiple hands so I guess I can't guarantee somebody didn't. I'll do some more methodical testing and try to isolate...

So I’ve cleaned and lubed a few floppy drives now, and I’m running into a weird issue. I have a stash of old floppy disks (1.4MB and 800k) but all of them show this so I think it’s the drives. (?) Basically if I format a disk it’ll work on that drive. I can copy data to and from it, etc. But...

I have an SCA-80 drive in my 7300 right now with an adapter similar to that; although it was purchased with the drive from Other World back in the late '90s. Unlike the adapter in the pic, mine has onboard termination. Maybe that's your issue?

Yeah, unless your CRT is absolutely screwed that’s gotta be analog board. If you haven’t yet, find a PDF copy of the Dead Mac Scrolls; it includes a list of symptoms, and the troubleshooting steps for each. Archive.org will have it when they’re back up, there are other places in the meantime...

A lot of PPC-era Macs had internal IDE, so the need for a Blue/ZuluSCSI is greatly reduced. Anything with internal IDE is absolutely better off with an off the shelf PATA SSD, IMHO. My G4 tower, I have one of those as well as a CF card in a PATA adapter and both are rock solid. That said, since...