Tooth Invaders (German) VIC1938 added to openretro.org and here.
VIC20 40/80 Zeichen Karte, thanks to Sven Petersen
Books -> Development -> 8-Bit Development
Introduction to BASIC Part 1 and Part 2
Jelly Monsters and Rat Race danish manuals for VIC 20, thanks to Uffe Jakobsen.
Brinck br824a – electronics diy for C64 and Vic20 (Danish), thanks to Peter Krogtoft.
Compute!s Commodore Collection Volume two, thanks to Peter Krogtoft.
We’ve open sourced our designs for a modern C64 that won’t kill your C64 it if breaks.
Using the 4A part will make it powerful enough to power a C128. Everything, well almost, you need is described in the project of github.
You can find a link to the project in our DIY Open Source Stuff page, found in the menu Misc -> Own Production.
It is rumored that the pcb can be fit inside the C64c model of the brick psu.
Compute!s Second book of VIC
VC20 8K Ram Speichererweiterung Bedienungsanleitung (German)