@jonny29797 take a look at the left hand side of your image. You can clearly make out that your board is a 837-7996. That means your board is a
Model number:837-7996
Country:Europe
Type: VA0
ASICs: IC3 315-5378 and IC2 315-5377
Year: 1991
We are really not into modding anything. We are more the repair type crowd. There are plenty of great sites like [https://www.retromodding.com/collections/game-gear?srsltid=AfmBOopy59UZrgSCVeP3ky8bMlVFJ-ccH_duPOqxN0tAtIcqSh5pkQjo|this one] and many others that adress mods etc.