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New old stock, plenty available for about £10 here in the UK. Here's one fresh out of a Motorola box for £3, new; https://ebay.io/m/LRfS6G

Luckily you only have to desolder the customs. And we've reverse engineered the GLU and ADB, the ROMs and the SWIM are socketed, the BBU is socketed. You'd just need the SND chip, really. And alxlab have the filters. Everything else is an off the shelf part!

Not biased or anything, but honestly I'd get a reloaded board and transfer, at this point, you're likely dealing with too much corrosion between layers, bridged by the vias and manky traces. If you did patch it, it's only a matter of time before another one dies... And another... And another...

Please re-read the Forum Code of Conduct here: https://tinkerdifferent.com/pages/conduct/ If you can't be polite, respectful of others - maybe this isn't the place for you.

Wanna have a go at reverse engineering an IWM / SWIM replacement? :D

What happens in the old PC World, is something called 'Load Line Calibration' - sure you may set a voltage to say 1.8v, and under idle, it'll be around 1.78 to 1.79v, close enough - but the moment the part is under load, the voltage sags to say 1.6v, which may be out of margin. It would be worth...

Glad I could be part of getting this place started, it seems to be ticking along quite nicely and no outages or data loss in that whole time...! I'm especially enjoying the bi-directional weekly LLM generated summaries posted both here and on discord.

Honestly, a little shell shocked about this. Learning this evening that he passed has really been a gut punch and has unpredictably led to some genuine tears, especially in the wake of the passing of Walter Koenig on Sunday. It's reminding me that I'm in the stage of life where childhood...

Because it's a 1:1 clone.

1oz copper should suffice, 28v DC is what the ADC uses - https://www.digikey.co.uk/en/resources/conversion-calculators/conversion-calculator-pcb-trace-width Use that calculator to find out if the trace widths will carry the current load.

The latest revision of the board has an extra address linenfir the ROM so people could test using the Classic ROM, as they're identical in almost every way bar the floppy disk select.

Why do I have a sneaking suspicion this would be of use to @geerlingguy ?

Might be worth posting this as a banner notification too?

Awesome! How come you went with the '881 instead of the '882?

The A vs B is merely an erratum fix, it may have just partially died, as the A version can still address 4MB.

Just checking, you don't have the ram jumper set, do you?

If you need to though, you can still buy the 180c's Sharp panel as it was often also used as an industrial display.

It only affects monochrome panels.

The only part number that matters is the apple one - 344S1018 - the others are the internal designation for the part, as they were made by Philips, VLSI - whoever had capacity, there were multiple sources.

*sigh* I wish we had things like this here... One day, I will make it to one in the US, when the swollen satsuma is long gone.