公开(公告)号：CA985788A

公开(公告)日：1976-03-16

申请号：CA135904

申请日：1972-03-01

Applicant: IBM

Inventor： KEY BRIAN D ,  HOCKINGS MICHAEL L H K ,  LOVELACE MICHAEL N G ,  STREDWICK JONATHAN B ,  RANKIN HOWARD C

IPC: G06F13/38

Abstract: A communications control unit, integrated into a processor, enables lines and modems to be changed or replaced by different types of lines and modems without changing the control unit hardware. A common modem adapter design can be used in the control unit for different data rates. A processor microprogram and a simple control unit local microprogram (dynamically changeable during the transfer of data) obviate the need for different adapters for each line and modem type. Both microprograms cooperate to control data transfer.