By means of diodes and resistors, this module protects the userport CIA chip of the C64 from overvoltages at the looped-through userport, applicable to userports of all C64 models. With parallel cable connections for two floppy drives.

https://www.faszinationc64.de/Commodo...

00:00 Introduction & Functionality
01:39 Building the kit version
17:09 Operating



40 years after its launch, the popularity of the C64 is at a new high.

The reasons for this have not changed: The highly accessible concept of home computers of that time allowed even laymen and the inexperienced to enjoy a maximum of Do-It-Yourself tinkering experience, the likes of which could never be had again later.
This nostalgic train of thought eventually led to the creation of the hobby project "FaszinationC64".

Well-known hardware reissued and completely new developments fuel the continuing appeal of the C64 universe. FaszinationC64 offers hardware around the Commodore 64 as ready-to-use modules and kits for self-soldering.

https://www.faszinationc64.de