The
IBM 3705 Communications Controller is a simple computer which attaches to an
IBM System/360 or
System/370. Its purpose is to connect communication lines to the
mainframe channel. It was a first
communications controller of the popular
IBM 37xx series. It was announced in March 1972. Designed for semiconductor memory which was not ready at the time of announcement, the 3705-I had to use 1.2 microsecond core storage; the later 3705-II uses 1.0 microsecond SRAM.
Monolithic System Technology components, similar to those in S/370, were used.