Sinistar
Speech
board schematic by Sean
Riddle (8k)
Speech board check plot (73k)
Speech board bottom layer (19k)
Speech board top layer (9k)
Speech board top overlay (56k)
Nintendo color inversion (tested, works great !!!)
Check plot (90k)
Bottom layer (15k)
Nintendo color inversion with built-in audio amplifier (tested, works great !!!)
Check plot (125k)
Bottom layer (19k)
Top overlay (100k), magnified 2 times
Galaga small board (found on blue boards set)
Check plot (41k)
Bottom layer (14k)
Top layer (12k)
Top overlay (24k)