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I have a 8050 drive in my collection for about 25 years, now that I have a working PET 8032-SK, wanted to see if the two will work together. After a bit of a cleaning, powered it up, middle led stays green, Drive 1 led lights up long, goes off, lights up short, then stays off. Drive 0 led...

4 DRAM memory chips replaced until PETTEST completed 16 full memory test cycles. "New" CPU and CPU socket, two new filter caps, all from aliexpress. It has some rust over the oscillator cover and inside the case, some dust here and there. Case says 4032 on the back, has a 12" display and...

Another PET 8032-sk, board assy 8032030, pettest gave initially: Bad between characters 64 and 127, that was a D6 issues, so I replaced UA6 and UA7. Then it passed Page0/1, however now gives this weird screen repeating "k dram memory test" and monitor high voltage shuts off in a few seconds...

Found in the attic an Audio Sonic 1392 Advanced Programmable Video System made by Radofin (sold also as Acetronic, Prinztronic, Fountain, Grandstand, Hanimex and Lansay in other parts of the world). Have no idea where or when I got this, but I have no cartridges to test it so I designed one and...

Bought this early 90s in the market, when everything that was movable was sold beside fruits and vegetables by people coming from former soviet member states. For the ram chips K155RU7 that are TTL, their pinout, and that they are analog to F93425APC, haven't found much else. Would be...

Finally have some time to work on a dead PET motherboard (no chirp on boot, no image on screen) that was laying around for about 20 years now. It was missing the CPU, so just bought a 6502 from Aliexpress (it may be a fake but at least pins seems to match). It has good looking reset signal, and...