A lot of people today who love Commodore 8-Bit computers enjoy them for their hackability. This board is one of a host of similar hobbyist products that make prototyping, hacking and exploring the electronics side of the computer much easier.
A breakout board is one that allows the computer to continue functioning normally, while exposing the lines of some port or IC socket to the electronics hobbyist, with minimal fuss. This particular breakout board plugs into the Vic-20's wide expansion port, and has labeled downward–facing pins that line up with the pin spacing on a standard prototyping breadboard.
The +5 VDC and Ground lines from the expansion port lead to pins which are inserted into the power rails on the outside edge of the breadboard, and the rest extend a bit further to plug into the main inner section of the breadboard. A handy reset button is built in, connecting the expansion port's reset line to ground.
You should not attempt to use one of these breakout boards, unless you are well versed in electronics and know what you're doing. Any damage you cause to your computer will be your own fault.
It's an incredibly handy board for doing quick prototype or tinker jobs. jbevren, January 2018
David Wood, also known as Jbevren on IRC, picked up one of these at a computer show. He has been using it to prototype an EEPROM Shadow Rom. The KERNAL rom from inside the computer has been pulled, and inserted into the first breadboard. The breakout board connects the breadboard to the Vic-20's expansion port. The only additional line from the computer required for his project is the black wire that can be seen sneaking out the corner of the expansion port. That line is inserted into the Chip Select pin hole of the KERNAL rom's socket on the mainboard.
Looks like Retro Fun!
In this next photo, the final version of the project can be seen. It is the tiny yellow board into which the KERNAL rom is plugged, near the front right of the mainboard, with 5 colorful lines coming off it.
