[Vectrex SD Cart?]

Can't wait to get mine ordered

[Vectrex SD Cart?]

PM sent

[Mini Arcade Alert!]

Correct. The Data East ones have a slightly different PCB.

 

The IOB points are actually just 3 points and a ground, not 6 separate points.

 

Rolling Thunder - no connections

Pac-Man - IOB 1

Mappy - IOB 2

Galaga - IOB 3

Dig Dug - IOB 1 & 2

Galaxian - IOB 1 & 3

I modded my Galaxian with a 2P6T rotary switch to access all games as above.

I could possibly do a guide if anyone is interested