The second is having a display issue and I have no idea where to start looking; it seems that the its "functioning" as PRINT "HELLO" causes the screen to display a slightly differently corrupted line at the top, CLS refreshes the screen back to the picture below etc. Sorry about the quality of the picture - it's a photo of a CRT, used specifically in case it was an issue with my LCD screens and has been used for both my other Minstrel and my composite modded '81.
I've checked the soldering with a magnifying glass - as far as I can tell all joints look good. The only "divergence" away from the standard kit was I socketed all the ICs rather than just the ROM/RAM and CPU and used the same make rolled-pin sockets as supplied in the kit.
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If yes, then the problem is limited to the part of the circuitry that generates the pixel data,
I tried it a few times, just in case of typos (powered off and on between tries to make sure there was nothing in memory) and the screen stayed garbled and stable - no discernible save pattern. The issue I have is that if there was an error code, I couldn't see it - the screen being screwy really doesn't help.
I tried the same on my other Minstrel - and got the save pattern and tones on the cassette.
I have a very limited supply of diagnostic tools - essentially a multimeter and that's it.
Any advice on the next steps?