4 board set Etched in copper.. NUTTING ASSOC INC 104-0012 ASSY NUTTING ASSOC INC 104-0013 ASSY NUTTING ASSOC INC 104-0014 ASSY NUTTING ASSOC INC 104-0015 ASSY No ROMS found on any board 104-0012 .B2 (7420) and .B3 (7430) had G stamped on them Crystal - couldn't read value - measured 14Mhz with a scope 104-0015 8 Adjustment pots