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#diagnostic

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Wintermute_BBS

Today, I picked up my loose ends with regards to the #Czerweny #CZSpectrumPlus, the #rare #ZXSpectrumPlus clone from mid-1980s #Argentina.

Since I was unable to remove the ICs myself (did they use "nuclear solder" back in the day?! Those ICs sat tight in their holes) I asked a friend who had a friend who was up to the job and very professionally removed these at his workshop.

So today I soldered sockets in place and prepared a #Diagnostic #ROM in order to find out what the problem is. Looks bad.

I have already replaced all "lower" RAM chips with new ones, leaving the "upper" RAM as they were.

However, given that *all* memory seems to be faulty, I now expect the #ZX8401 to be the problem. So now I need to get either one of those modern drop-in replacements or start hunting a real one ...

On the up side, video is working and the beeper is beeping. At least.

#ZXSpectrum
#Repair

re-equipped mainboard of the CZ Spectrum Plus, now with all ICS placed in sockets.
Photo of the Diagnostic ROM output: Lower RAM addressing error! (Suspect IC3/IC4 or PCF1306P / ZX8401 / 40058) Bad upper RAM IC codes: 7 IC22 IC24 IC6 6 IC21 IC23 IC6 5 IC20 IC22 IC6 4 IC19 IC21 IC6 3 IC18 IC20 IC5 2 IC17 IC19 IC5 1 IC16 IC18 IC5 0 IC15 IC17 IC5
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C.

It seems to "just happen" in some #projects. `poetry install` should set up executable scripts in the venv's bin dir for them - but it just doesn't do it. And no matter how high you crank the verbosity, it will not emit a single #diagnostic to tell you *why* it isn't doing it. At one point I thought it only happened with projects using src-layout - but I'm not so sure about that now.

Documentation? Of course there's no mention of it. It should Just Work.

2/x

#JustWork#SilentFailure
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