Recent content by RetroViator

Wiring up a DIN connection is never fun, but it happened. I was able to determine which pin on the motherboard was connected to vcc and which went to ground. After that, it was a guess which was the clock and which was data. I messed up due to a bad diagram, but once I was looking at the correct...

Thanks to some help on the Vogons forum, I figured out the problem with my CPU and cache controller. The orientation was correct, but the chips were swapped! The CPU goes in U386, next to the FPU, and the cache controller goes in U385. Now that I know that, I can see it identifies the chips on...

I picked this project up again, and I've had some success, but not enough. I was able to find the cause of the short on the +12V rail. By injecting 1V at 2Amps into the +12V power pin, and using my thermal camera, I saw a 10uF ceramic cap was getting hot near the PSU connector. After replacing...

I've got a Kaiweets KTI-W01 thermal camera running firmware version 1.4.1. I have downloaded the latest version of the IRImageTools software from the Kaiweets website (version 1.0.1.22 -- the camera came with 1.0.1.14). The software is basic and the documentation very thin. Does anyone know...

I ordered the Korad KA3005D, which may not be original, but worth a shot. I was tempted by the Frinsi DPS-150. The Korad should arrive soon and I’ll put it through its paces.

I edited my post above because I was wrong… The GitHub page for the original Power Up IIusi design is still available at https://github.com/CayMac-Team/IIsi-PCB-Replacement.

If I remember correctly, I was seeing the ripple on the 12V DC before it got to the PicoPSU. So, it seemed to be coming from the AC/DC converter.

I’ve had the Mac-o-Meter plugged into the external floppy port while running the IIsi through its paces and not noticed any significant voltage drop. However, the heaviest load I’ve put on it is a PowerPC upgrade card and a BlueSCSI. Like its LC siblings, the IIsi was not made for serious...

I should have added that I have a couple of the earlier PicoPSU boards, complete with parts (except with IIsi wiring harness and mains plug), available if anyone want to pay the shipping to get them.

I have built both versions of CayMac’s Power Up IIusi. The first used a PicoPSU, and the second is the model in this thread with separate Mean Well units. I prefer the Mean Well version because it requires no modification to the mains outlet and it produces cleaner power. The PicoPSU version...

I tried running it through the Container Station GUI, which lets you bring in yaml files. I suspect this was my problem. An SSH terminal may be a better method.

Any recommendations for a bench power supply? I have a basic model, and I’m ready to upgrade to something with more intuitive controls. For something as important as power testing, I don’t want to make a dumb mistake due to a stupid knob or clumsy button.

The video showed up in my feed this morning. You did a great job, both with the project and the video. I was impressed with the thoroughness of the documentation. Very professional. I'd be interested in a group buy, if that takes off.

Thank you! I have been using this as a project log, which may not be how some would like to see the forum used. I figure this information might help someone else if they get a similar machine or face similar problems. I appreciate you reaching out and providing some encouragement! I'm a bit...

Wait a minute... I have been thinking of the AT power supply connector backwards. I've been going at this all wrong. When I plugged in the PSU, I should have noticed my mistake, but I did realized the problem when I started checking resistance between the power supply connector pins and the ISA...