More C64 Repair Logs

During the last couple of weeks I’ve received 8 (!) broken Commodore 64 machines that were in need of repair. The repair logs of three of them have already been described here (link), while the latter five had issues ranging from faulty Serial Ports (link, link, link), … Read more…

Commodore 64 blacj screen fix using third party PLA chip. Read the review on breadbox64.com

A Plethora of PLA’s

The most common cause of a black screen on the old Commodore 64 long boards (link) is a broken Programmed Logic Array (PLA) chip located at position U17. Based on different input signals, the PLA creates chip select signals and controls which chip is to … Read more…

Commodore 64 Project SIDFX sound mod. Swapping between SID chip files by flicking a switch. Read more on breadbox64.com

The SIDFX Sound Mod

The semi analog SID chip (Sound Interface Device) is an electronic music synthesizer and its distinctive sounds are easily recognized by any Commodore 64 owner. Back in the days, most SID tunes ended up in games or demos to basically support the graphics on the … Read more…