HigashiJun wrote: ↑Sat Feb 10, 2024 5:24 am @rubber_jonnie

BTW, do you have a THOMSON computer in all your collection ?

I don't, no. I don't feel compelled to get one either, at least not like some other machines.

OK, so it looks like the PSU for my old Macbook Pro that I use on my workbench is mostly responsible. Will need to see if I still have a spare and if it's as bad.

@rubber_jonnie my desk magnifier interferes with the Scope signals, I need to take it to bits and work out why but just never get round to it. Have you checked your Scope leads? recalibrated them with the test signal? Yeah, my first step was to switch everything nearby off and calibrate the probes ...

PhilC wrote: ↑Fri Feb 09, 2024 2:30 pm @rubber_jonnie well it been a long process but I can at least fix the things now and upgrade them.

Looking forward to seeing how you get on with yours soon.

If the PSU adapter arrive anytime soon!

HigashiJun stephen_usher was correct, I just got a TRS-80 Color Computer... Personally I blame Icky for sending me some Coco books :) Also, weirdly I'm having some 'scope fun and games, found out trying to look at the test points on the MZ-700 at lunchtime. This pic covers both scopes, my Owon unit...

Another quick update. The Open128 board is now fitted inside the C128D and the only real problem I've found is the alignment of the modulator ports. In my case I have replaced the modulator with an S-Video and Stereo Jack board but I'll have to tweak the case holes slightly so I can actually use th...

Sounds like good progress, very much looking forward to seeing this running.

HigashiJun wrote: ↑Fri Feb 09, 2024 10:25 am I've been away for a 5 day business trip abroad only to discover that our fellow member @rubber_jonnie got two retro machines meanwhile...

I just can't help myself.

stephen_usher wrote: ↑Fri Feb 09, 2024 10:32 am Don't go away again, he'll get more!

You know me so well

Well thats a bit weird. The MZ-700 has a great service manual, puts others to shame and gives these waveforms and tells you the test points to look for them: Screenshot 2024-02-09 at 00.00.32.png Said test points can be found here on the schematic: Screenshot 2024-02-09 at 00.02.02.png And the PCB h...