Commodore PET 2001 repair: dealing with MOS 6550/6540. @iz8dwf

iz8dwf | Commodore PET 2001 repair: dealing with MOS 6550/6540. @iz8dwf | Uploaded February 2018 | Updated October 2024, 57 minutes ago.
Commodore PET 2001, PCB 320008, S/N 1006088 How to deal with MOS MPS6550 static RAMs, testing and replacement, and MPS6540 ROMs.
PET 2001 test code:
ceffy.de/2001test10.bin

The owner of this 2001 ordered a couple of original 6550 to replace the faulty ones, as it can be seen at the end of the video (where only the ROM replacement is a non-original component).

Making a vector monitor Pt. 4: Deflection yoke and driver issues.

Commodore PET 8032-SK repair. Making a new old school troubleshooting tool.

Gallag arcade (Galaga bootleg) #2 : Reverse engineering

$Yaesu FT-817 hamradio transceiver repair. Fuse and fused trace. This Yaesu FT-817 (S/N 21540153) wouldnt power on. The problem was due to a blown battery fuse and an interrupted trace on the 13V unswitched supply going to the Panel PCB. Yaesu FT-817 service manual: https://www.fracassi.net/iw2ntf/manuali/FT817_serv.pdf Timeline: 00:00 - Welcome 00:37 - Opening it and inspection 01:32 - Battery fuse 02:38 - The green wire ghost 06:38 - Bad capacitors 08:32 - Broken trace 10:44 - Testing buttons 12:00 - A 6m QSO$

Dead Commodore 16. Making a MOS7501/8501 replacement adapter with a 6502. Part 1.

Commodore SX-64 Executive repair. Yet another black screen.

Commodore 1571 disk drive repair pt. 2: Replacing the R/W heads

Commodore 1571 repair pt. 1: track-0 sensor failure and bad heads