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I am an engineer and I have worked in electronic hardware development since 1994. Before that, I have written professional software since 1980. First for Commodore computers, later for MS DOS.

My first own computer was a Commodore VIC-20 and in 1983, I have bought my first C64.

After watching some repair videos of old retro-computers on YT (mainly Jan Beta), I have tried to switch on my good old C64 in 2018 - after being powered off for about 28 years. I could not believe my eyes, it worked and I was probably as fascinated as I was, when switching it on for the first time. Soon, the C64 setup became kind of a fix installation in my lab.

My interest in the Commodore retro-computers is, besides collecting and repairing them, to develop some new hardware gadgets for them. Those projects are strictly non-profit, open hardware and are/will be published in my
github repositories for everybody to build.

My goal is to provide some well tested and easy to build projects. I try to document and test them well, before I publish them.

You can meet me on Twitter and follow my projects while they happen:
@svenpetersen191

I am also active in the FB group "Commodore 64/128".


● Dec. 4th, 2019: CBM80 or the "Signature of Death"/Kernal v2.1
● Dec. 6th, 2019: Colored
C64 Block Diagrams
Scope on the C64 (scope screenshots and some explanations)
I have developed and am developing C64 related hardware/software projects.
● The
C64 A/V-adaptor (there is also a version for the early 5pin C64 and for the VIC-20)
SIDalyzer - Analyzing the SID
● A 1980s project: A
new character set for the SX-64
● 3D printed spare part: a
head latch cam for the 1541-II floppy disk drive
● The
C64 joystick project
● The
Diagnostic Rev. 586220 Harness
● Making a
Diagnostic (and Dead Test) cartridge

The Power Supply Projects:
● The first
C64 replacement power supply (230VAC)
C64 PSU Combi (115/VAC230VAC)
C64 PSU Global (115VAC/230VAC)
● PolyPower64

C64 Schematics
Whenever I find Commodore or thrid party documents regarding Commodore computers, I will scan them and publish them (elsewhere) to contribute to the retro computing knowledge pool.
Umrüstung des SX-64 auf Modulatorbetrieb (German: Modification of the SX-64 for using a VIC-20 RF modulator)
Bedienungsanleitung ZERO EPROM Programmierer (German: Manual of the Zero EPROM Programmer for C64)
VIC Eromprogrammer-/Epromboard-manual (English, a short manual of the ZERO EROM programmer)
VC-64 EPROM Karte & EPROMKARTE - ZERO 43 - fuer den CBM64 (German)
VC20 - 40/80 Zeichen Karte & VC20 EPROM Karte (German: VIC-20 40/80 character display & VIC-20 EPROM board)
Commodore Super Expander User Guide
VC 1020 (German user manual of the VIC 1020 expansion port externder)

For HIRES/high quality manuals, I collaborate with
Retro Commodore .
Topics of a more general nature.
ESD kills your electronic. Protect it!
● Project:
Solder Fume Extractor
● Modelling the
ZIPPYY arcade joystick in Fusion 360 and a short description of the function
● Creating
EPROM images from multiple *.BIN files
Cable Making
A Beginner's Guide to PCB Layouting