These are equivalent to the Atari boards, but smaller. Allows a Major Havoc PCB to be plugged in to a Space Duel cabinet and can provide pincushion correction when using a WG6100 monitor.
The board uses all through-hole components to make them easy to build. Populate it fully to get pincushion correction, and choose whether to install the adjustment pots on the inside or outside of the board. You can also choose to install just the edge connectors, two resistors (for the volcano LEDs), and one jumper wire to convert the pinouts but not the image.