Recent content by Garrett

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...

The CRTs themselves are all interchangeable from the 128k through the Classic II. What is not interchangeable are the yokes and neck boards. If you have a dead tube, you'll have to swap over the neck board and yoke assembly from the destination machine. There's a caveat though - if you move...

Just to close the loop on this for others following along. I did test the card in my IIci last night, and it works perfectly. Those that say the pins are bridges intentionally would seem to be correct. Thanks all for the responses! I see there's a v3 ROM dump for this card - would that provide...

I picked up a Thunder/24 card, and had a concern before trying it out. It appears a few pins of U5 are bridged (see photos). Is this normal? Can anyone else with this same card confirm? They don't look intentional, but it also doesn't appear to have been reworked either.

Fun looking support structure! Did you have some trouble with layer shifting during the print?

Great job with a very stubborn board! Goes to show that capacitor leakage can often be just as frustrating as an exploded battery, and nothing is a guaranteed "just needs a recap." Is it safe to say that the coming out of reset delay was caused by the sound chip? I'd be interested in whether it...