Recent content by Garrett

Another great writeup, David! This seller had two of these listed - I picked up the other one he had. Like yours, it also appears to have been a user-upgraded machine, but didn't have the fun "custom" sticker on the front face. Mine was listed as "bad power supply," but spoiler alert the power...

I decided to revisit my issues with this RAM card once again. I thought I could be clever and connect the PowerBook to my newer Mac and use Serial Diagnostics, but I can't get it to talk with my new Mac at all. The Sad Mac error I get is 0000000F 00000002, which doesn't seem RAM related based on...

I've had a few troubled boards I've been putting off working on. This past March, my motivation to do something with these boards increased! This was due to the wonderful new Reconnaissance application, developed by @jack 68k. First up was an SE/30 with some boot issues. Reconnaissance informed...

I’ve had this issue before, and found that it’s made worse by cleaning the blue rollers with IPA. They’re slipping on your metal shafts. Now any PowerBook I work on automatically gets new silicone rollers. If I recall, you’ve done this job to your Macintosh Portable. Good news- the PowerBook...

Wow, this is so cool! Thanks for posting. I suppose a card like this could be recreated, if it weren't for the missing PLD code.

Great work! I saw this card on eBay as well - glad someone here snatched it up. Looks like the same RAM ICs that the PowerBook 1xx series uses. Did you have to tinker with the jumpers to get it working? I wonder why Dynamic Engineering didn't use the dedicated RAM expansion connector, but rather...

That's interesting that when swapping DFACs, the issue stays with the board, not the sound chip. I had an LCII with bad audio once, and replacing the DFAC did solve my issue.

Hi James, here's another idea. I once had a Color Classic board which would power up, but never "bonged" or displayed an image. The fix in that case was removal of both ROMs, scuffing the legs of each, and reinstalling them into their sockets. I've had to do this trick with a couple of LCIII...

See my post in this thread. I included a few benchmarks from the Apple Diagnostics application. https://tinkerdifferent.com/threads/iici-cache-card-three-tone-chime.2798/#post-27601

That's the first time I've ever seen a 68EC030 in use on a Mac. Was the lack of MMU acceptable on a machine that shipped with a 68000 CPU? Unsure if that's the cause of any issues but interesting to see nonetheless.

Are you using the High Res or VGA modded analog board? That may factor into the types of adjustments available. I've only ever done the 68V VGA mod myself and haven't run into this issue. Generally, people seem to have trouble setting the horizontal width as it should, so I'm surprised it's the...

Yup, that sort of behavior is almost certainly a failing flyback. Replacing capacitors and/or the CRT isn't going to help.

I couldn’t live with the improper size and removed the 575 flyback right after I tested it. Based on what you’ve said, it does sound like your flyback is going out. Unfortunately a replacement would have to come from another Color Classic analog board.

I share the same feelings regarding the TechStep. I was so excited to get my hands on an original one when an opportunity presented. The sad thing is - I hardly ever use it. I have a stack of 4 or 5 defective IIsi boards. Just for giggles, I connected the TechStep to a few. Boards one and two...

This is so fascinating. I’ve never thought to open one of these up for inspection. I don’t think my ultrasonic cleaner has killed any oscillators, but I do recall dealing with one damaged due to battery corrosion. My mistake for trying to reuse it on an SE/30 reloaded board. On a related note...