NEC ACOS System 450

These were mid-size general-purpose computers. They had complete compatibility with the previous S300 and S400, and employed microprocessors throughout the machine. The S450 had additional multiprocessor functionality and paging capability. It also had an input/output DAT mechanism, and was designed for compatibility with the S550. Reduced size and weight, and higher reliability, were achieved by using high performance LSI, such as 1,200 gate CML LSI for logic, and maximum 6,000 gate N-channel MOS for peripheral control, such as workstation control and CRT control.