Top side
------------
IC5     IC1     IC2     IC4
 
IC6     IC3     IC9     IC11
 
IC10    IC14    IC13    IC12
      <<CONNECTOR>>
 
 
74F373 (IC5, IC1, IC2, IC4, IC6, IC3)
LS245 (IC9, IC13)
74F245 (IC12, IC11)
74LS357A (IC10, IC14)
 
 
 
Bottom side
------------------
 
        <<CONNECTOR>>
 
                    IC7
   
    IC16
    
    IC15        IC8
 
 

CY7C199-25VC (SRAM, IC15 & IC16)
Sega Part #317-0229 (Custom Sega chip at IC8)
Lattice pLSi 2032 80LJ D617S25 (Sega Part #315-6001 at IC7)