NEC ACOS System 2000 Series

In February 1986, NEC announced a series of ultra-large general-purpose computers which were the largest and fastest in the world at the time -- the ACOS System 2000 Series. This series employed a range of LSI technology including: ultra high-speed logic LSI (CML) with 1,000 gates and a delay time per gate of 100 picoseconds, ultra high-speed ultra high-integration logic LSI (CML) with 4,000 gates and a delay time per gate of 170 picoseconds, 16-kilobit ultra high-speed bipolar RAM with an access time of 3 nanoseconds, and 1-megabit DRAM. It also employed mounting technology to enable installation of a maximum of 42 LSIs on a 10-centimeter-square multi-layer ceramic board, and used a direct liquid cooling system which performed cooling with liquid instead of air (as in previous machines). It also employed innovations such as the pipeline system and the integrated array processor system. This approach made the series the largest and fastest in the world.