Indy 500 (Sega Model 2B)

Original Sega Indy 500 Model 2B arcade game circuit boardset from 1994 that may be working. This one boots to "Checking Network" message and goes no further. We believe it needs to have another board installed to power-up, but aren't positive.  We don't have too much experience with these boards.  Includes the main three board stack (CPU, Rom and Video board) and filter board all in very good condition. 

Boardset is sold as-is since we cannot fully test it. It appears to be at least partially working (if not fully working).