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    • Commodore 64
      • Assy 250407 Rev. B #1
      • Assy 250407 Rev. B #2
      • Assy 250407 Rev. B #3
      • Assy 250407 Rev. B #4
      • Assy 250407 Rev. C #1
      • Assy 250425 Rev. A #1
      • Assy 250425 Rev. A #2
      • Assy 250425 Rev. A #3
      • Assy 250425 Rev. A #4
      • Assy 250425 Rev. B #1
    • Commodore 64C
      • Assy 250469 Rev. 3 #1
      • Assy 250469 Rev. 3 #2
      • Assy 250469 Rev. 4 #1
      • Assy 250469 Rev. 4 #2
      • Assy 250469 Rev. 4 #3
      • Assy 250469 Rev. 4 #4
      • Assy 250469 Rev. A #1
      • Assy 250469 Rev. A #2
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C64 Repairs

These are posts related to hardware repairs and how they were fixed.

C64 RF Modulator Battle

December 14, 2021December 13, 2021 by MtnBuffalo

The video signals coming from the Commodore 64 have always been challenged by inherent ‘clock noise’ of the VIC-II graphics chip and the color bleeding of the S-video signal. The problems are easily recognized in the form of vertical lines (banding artifacts) or as a … Read more

Categories C64 Breadbox, C64 C, C64 Hardware, C64 Mods, C64 Repairs
The PLAdvanced+ PLA replacement chip for the commodore 64. review on breadbox64.com

The PLAdvanced+

June 25, 2018 by MtnBuffalo

This may come as a shock to some, but the sad news is that the old chips inside a Commodore 64 will eventually fail!! Most often the chips will simply die due to old age or other external factors like a faulty power supply. When … Read more

Categories C64 Breadbox, C64 Hardware, C64 Mods, C64 Reloaded, C64 Repairs
Commodore 1541 Diskette Drive diagnostic test cartridge. Tested on breadbox64.com

1541 Diagnostic Cart

December 16, 2017December 12, 2017 by MtnBuffalo

Repairing Commodore 1541 Diskette Drives (link) is not something I have tried before. But when I recently had these four broken drives thrown in my general direction I had to take up the challenge! The problem with diskette drive repair’s is that most diagnostick software … Read more

Categories C64 Hardware, C64 Peripherals, C64 Repairs

More C64 Repair Logs

August 29, 2017August 23, 2017 by MtnBuffalo

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

Categories C64 Breadbox, C64 Hardware, C64 Repairs
Jupiter Lander running with failed RAM chips. breadbox64.com

Brute Force Repair!

August 29, 2017August 16, 2017 by MtnBuffalo

I have fixed quite a few broken Commodore 64’s, but this one was by far the most challeging one! The machine started out as a simple memory fault that was fixed so it could run the cartridge game of Jupiter Lander. However, it took a … Read more

Categories C64 C, C64 Hardware, C64 Repairs

Broken C64’s Repaired

August 15, 2017August 12, 2017 by MtnBuffalo

I just got this stack of broken and badly discolored Commodore 64C’s from a friend. The cases were made in China, Hong Kong and Germany… The first board is an Assy 250469 Rev. A board that had a broken keyboard – some of the keys … Read more

Categories C64 C, C64 Hardware, C64 Repairs
Commodore 64 blacj screen fix using third party PLA chip. Read the review on breadbox64.com

A Plethora of PLAs

July 5, 2018December 19, 2016 by MtnBuffalo

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

Categories C64 Breadbox, C64 Hardware, C64 Mods, C64 Repairs
Commodore 64 Version B-3 motherboard, Assy 250466.

Got the Assy 250466!

June 10, 2016May 6, 2016 by MtnBuffalo

My quest for obtaining the last Commodore 64C motherboard version in my collection (Version B-3) has come to an end! I finally managed to get a copy of the Assy 250466 motherboard for a reasonable price. I got the machine from a guy in England on … Read more

Categories C64 C, C64 Hardware, C64 Mods, C64 Repairs
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