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I have both 030-0687-B and 030-1246-A and they will be scanned as part of my ongoing scanning effort when I get to that shelf. Please feel free to poke me in my accountability thread if I get quiet on the subject, here...

Yes, @Phipli did this a few years ago: https://elephantandchicken.co.uk/stuffandnonsense/?p=1609

This is great, thankyou! What really tickles me about this is that I was going to see if I could build something like this as a joke (using S/PDIF optics); the fact that someone actually built it as a product is kind of wonderful. I wonder how much of a discount they got on their equipment...

yeah but aarch32 is the king of assembly languages and everything else is downhill from there ;-) (Sorry, I'll stop derailing the thread, just wanted to annoy people)

Yup, understandable; always best to check something works properly with the official software first. For what it is worth, I too use a TL866 II+, and at this point I exclusively use that minipro tool; it works great for me.

Oh, yeah, those are nifty. If you don't mind the command line, you don't need to have Windows installed to drive that: look at https://gitlab.com/DavidGriffith/minipro

Which programmer did you get? :-) It's a useful tool to have around

Eric Woo has an excellent reputation and the stuff I've previously got from him has been sound. He's not immune to his suppliers sending him crap - but then who is? - but he seems to deal with that situation well when it occurs. And that's about al one can ask.

Oh, well spotted. I'd completely forgotten that code was in Boot3.a. Definitely does feel like a workaround kind of situation.

Yes, if it's a 128k those use Micron DRAMs that are a bit notable for self-destructing. You may wish to replace them all, or if you don't, you may wish to keep (non-Micron) spares for when the remaining micron ones disintegrate. I think I got mine from ebay, but it was so long ago I can't...

Agree with both of you.

I generally use cotton buds. Whether this is a recommendation or not depends on your estimation of my competence ;-). It both evaporates more easily than and has lower surface tension than water. And it can take water along on both of these rides, which is why you should generally wash in...

OK - then ignore me - it looked a bit like the artefacting you get with some ADCs in more recent monitors, but that's obviously not the case here.

Just to check: this is reproducible between monitors, right? Especially on a CRT one? I can't tell if your picture there is on a CRT or LCD

It seems to be the current favourite thing to blame random unexplained glitches on - people want to feel like they've explained something, I think.

You could give it a go and see if anything happens! (Apologies, very late here and I don't have confidence in my ability to talk sense).

At risk of telling you something you already know, but before you go about removing chips, have you checked that the power on reset is working? I've seen this symptom when no initial reset is being generated. You can test this by pressing the reset button manually when it's at the stripes, and...

yes, well found!

No idea, I may be totally wrong. I'm going from memory here and it was a long time ago.

Yeah pretty sure it mostly works, IIRC the calculator DA breaks for some reason nobody has ever bothered to track down (??) but nothing major. People have done this pretty regularly over the last 30 years or so, most people who do it seem to think that they're the first. Action Retro really...