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This particular diagnostics cartridge does not require a test harness, and are specifically useful when your C64/128 has no picture. What sets this cartridge apart from the other test cartridges, are that they all require the RAM to be functioning to boot, (unfortunately, one of the most common fault is defective RAM) This cartridge not…

Some people just want a SD card solution for their Commodore 64/128/VIC20 the cheapest way possible. So I came up with the “Pennnysaver Edition”. It has the bare minimum you would need to load your games and programs from a SD card, but with the possibillity for upgrades later. It can be used with your…

I decided it was time to make some kind of replacement for the bulky Amiga 500 RF modulator. This little thing has a nice composite output and a S-VIDEO output for great video quality. Unfortunately, the female DB-23 connectors are hard to find, so I wont be making many of these. I figured the AD724…

This is a great solution for replacing a old floppy drive. It works like this: The gotek has built in 999 locations where you can place a floppydisk image. This image contains the contents of one floppy disk. These pre made images are usually easy to find on the Internet, but you can easily make…

This cartridge is a modified reproduction of the Magic Desk Cart made for Commodore 64. That particular cartridge had several tools accessible via a menu. This cartridge is built with the same idea, only with a bigger ROM, and by using a ROM that can be erased electrically without using a UV eraser. This cart…

Not every vehicle is equipped with equipment that tells you that the charging system is not working. That is certainly true for several of my vehicles. So decided to think of a way to monitor the charging system, but since I do not want some kind of big, expensive, ugly device for this, I decided…

Due to several friends have contacted me about my old Commodore 64 power saver, the Power Healer 64, Ive decided to revive the project and has made brand new design to this old gizmo from 2006. This time, I made 2 versions. One that is basically the same old design but with a few SMD…

I made a reproduction of the Commodore 586220 test cartridge. This cartridge was actually used by Commodore themselves to test every unit that came from the assembly line. They called it the “Commodore 64 Final Test Diagnostic Cartridge Rev 586220” and to fully test every single port and function of the C64, a special cable…

If you are a Commodore 64 user from back in the 80’s you probably remember the term Bulletin Board System or BBS. It was basically a computer connected to several phone lines, and other computers could connect to it via a phone number. The computer used a modem to do the calling. You could use…