iz8dwf | CBM PET 4032 (2001N) video fault repair. @iz8dwf | Uploaded January 2020 | Updated October 2024, 2 hours ago.
Commodore PET 4032 (2001-32N s/n 1005087) with a video circuit fault. The problem was fixed by identifying and substituting two 74LS TTL chips.
How character generation works on PETs:
youtu.be/PTKSLsCMRos?t=529
Chuck Peddle's Wikipedia page:
en.wikipedia.org/wiki/Chuck_Peddle
Commodore PET 4032 (2001-32N s/n 1005087) with a video circuit fault. The problem was fixed by identifying and substituting two 74LS TTL chips.
How character generation works on PETs:
youtu.be/PTKSLsCMRos?t=529
Chuck Peddle's Wikipedia page:
en.wikipedia.org/wiki/Chuck_Peddle
![Servicing Apple ][ and IIe power supplies: change the RIFA capacitors!](https://i.ytimg.com/vi/NpZgDRZhO4c/hqdefault.jpg "Servicing Apple ][ and IIe power supplies: change the RIFA capacitors!
Astec power supply for the Apple ][ (plain, plus, europlus) and IIe 8 bit computers. They employ some X2-rated capacitors made by RIFA. These capacitors always crack and with moisture entering, they short out and release a lot of smoke. Every power supply of this kind must be inspected and the problematic capacitors substituted before attempting to power them on.")
