J1 -- 60 pins, 4 serial ports, mouse, conf0-7 J2 -- 40 pins - 32 bits of data to MT1 memory board J3 -- 50 pins - 26 bits of address to MT1 memory board (and signals) J4 -- 20 pins - to FPA board J5 -- 34 pins - to "GE" board (Geometry Engine)
Tom's Computer Info / [email protected]