MELCOM 70 Series/Model 20

These Mitsubishi Electric machines, announced in 1976, were the first Japanese-made minicomputers to use bipolar LSI in their central processing unit. They employed the microprogram system, and used bipolar LSI with a 4-bit slice for the arithmetic control section, and 1 Kbit bipolar ROM for control memory. For main memory, these machines used 4 Kbit NMOS LSI with a 16-bit word and one parity bit, and cycle time was 0.5µ s.