Recent content by GreenBar0n

Using a cheap DMM with the Frequency Counter function, where there is no adjustable settings like an O-scope, you'll still get 1.305MHz at A(2). The Guide never mentions how to setup the scope. Either way it's confusing to a new user that has no idea what a working SE/30 board is supposed to...

Regarding only getting 1.305MHz at A(2) Pin 4 - when the ROM is removed: I think the Simasima Repair Guide was stating what the Frequency Target should be for each Address line with the ROM inserted, or as as a perfectly functioning Logic Board; yet when running the CPU/Walk the Bus Test, they...

From the Simasima Repair Guide: 1. After initial power-on, and the voltages stabilize, the sound chip releases the reset line 2. The CPU begins executing code 3. The GLUE logic maps the ROM to the start of the address space (address $0) 4. The CPU begins executing code from the ROM SIMM using...

I've found that making emphatic statements like "missing any Data line will cause a simasimac condition" tends to get a correction faster than asking the question: what Data lines can be missing and still work? I could ask the question: what Address lines could be broken to cause a simasimac...

Congrats and nice work, @Mark_W! A battery bombed board is serious work to recover from. I hadn't thought about the fact that I was also testing continuity from the PDS slot and not the CPU socket, initially, as the PDS is recommended in the Simasima Repair Guide for easier access; that must be...

I'm reading very close to the same voltage you listed above in the floppy ports, you're showing 5.04V and a 5.12V, I'm between 5.05-5.02 in all (4) and with the factory set potentiometer - am running the stock wiring harness for all of them. I measured 125Vac coming out of my wall socket; I see...

Didn't have too much time today to get this going, a really nice older couple I've worked with in the past called me to convert their standard HTML website to Wordpress - I'm an IT Admin and that's not been a regular request this entire past decade :). They're such good people that I was happy...

I have (4) Sony CR-44 PSU's here, (3) recapped and (1) stock but barely used. I'll get some voltage readings this weekend from all of them, including the floppy ports, the P3 connector +5V voltages on the AB, readings at 74LS38 VCC Pin 14, connector P4 pin 9 as it exits the AB to the logic...

Yes, was curious as to where the voltage increase or lack of resistance is coming from on the EU AB. Without knowing the voltage of the Sony PSU at connector P3 Pin 4/9, being able to follow the +5V rail to the floppy port was of interest. Understood about the add-on cards current requirements...

Curious what the 74LS38 VCC Pin 14 voltage is of the EU board, is it 5.16V there and also the collector of Q2?

Thanks so much @caver01, I really appreciate that! Without the Simasima Repair Guide, I was stuck and lost, had to take a year off and wasn't sure I'd ever get SE/30 #1 to work. Finding this site and the guide was the only way I could get the confidence to try again and then eventually succeed...

Got the thumbtacks today, had to drill the hole out in the 3D printed adapter, could be because I printed it at .12 instead of .20 so it looks smoother. Once I got the thumbtack in, the adapter fits well. Set the time and date, then powered it down, the time remains set. Need to clean the...

It's amazing to me that there is not a dedicated tool for such a task. I guess it's an adjustment that's rarely performed but there had to be a bunch of other TV/monitors that had that same requirement. I like your solution to the problem and thanks for the reply!

The only way you could go wrong there is if the chips are fakes - but if you checked out the sellers feedback and he has no history of it, that's a solid purchase.

For clarification, are you using the same recapped Sony PSU, with your (4) different analog boards?