Recent content by jmacz

Not going to try since it’s working great. :)

I'd need to get a oscillator. My other PB 540c with full 040 at 40MHz can keep running the MacBench pro tests and continues doing fine after many runs. I think you mentioned before you think it might be the memory IC that allows some to overclock and some to not be able to? I think I'll keep...

Haha... will get it. It died after two runs of MacBench 3.0 graphics tests. :) Looks like it's going back to stock speed.

Ran into a slight problem with the memory hack - the Viking card I have has a different layout. But it's working now. Overclock (40MHz), full 040 with FPU, and now 48MB of memory. Thanks to @croissantking! You can see @croissantking's full instructions (super easy to follow) here...

Viking card.. different layout. 1st and 3rd columns go together, and 2nd and 4th columns go together.

I had bought one of those smaller handheld rotary tools (Fanttek F2) and used the smallest grinding bit and just went super slow. After I got about half a millimeter, I went for it and it took many attempts but finally got a bodge wire to hold tight. That was really painful.

That was really painful but yes, that CPU is repaired. Had to cut away part of the exterior to get enough of the pin to solder onto. It's working, has the FPU, and I've overclocked it to 40 MHz and it's stable. Now for your memory hack..

Hmmm...

Argh.. image corrupted again. I've about exhausted the easy debugging... only thing easy left to try is a non emulated SCSI (ie. real disk). If that doesn't help, I'd have to start attempting repros while watching various signals, and not sure I have time or the patience for that. :) Actually...

Still doing ok. Hopefully stays that way.

Bravo!!! 👏 Awesome result!! :) I usually use painters tape over the little icons to avoid filler getting in there.

Yup, what @croissantking said. My bricks are two PSUs in one.. the battery side limited to 1A.

Yup.

Still running strong so far... 🤞

I might actually have a combination of problems and because of the permutations and the lack of a reliable repro, it's difficult to debug. I have found multiple issues including some found yesterday. PSU was dead, replaced, and then had the rails coming up separately issue (before). C6...