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today, my computer fairy wand is on: someone else's TRS-80 Model 100.
the soldered-on nicad battery needs to be replaced. the original's been in there since 1983.
oh, btw, why i was hired to replace the battery: in the 100, the ram doubles as semi-permanent storage like a disk drive, & the ni-cad battery is what preserves it when it's turned off. when it fails, a symptom is random memory corruption even after a cold start.
@arielmt Nice! I need to replace my battery too, because I'm positive it will start leaking soon.
i repaired vintage computers before, but up to now they were all mine, so it wasn't really a profession. now, after thorough testing of the Model T in my care, i can at last call myself a PROFESSIONAL vintage computer repair tech. *level-up.wav*