The IBM 2780 and the IBM 3780 were devices developed by IBM to perform Remote Job Entry (RJE) functions. They communicated with the mainframe via Binary Synchronous Communications (BSC or Bisync). The IBM 3780 was announced in May 1972. [1]
These devices were later emulated on various types of equipment, including eventually the personal computer. A notable early emulation was the DN60, by Digital Equipment Corporation in the late 1970s.[2]