Abstract: An interface (10) between a first (MC, 30) and second (SC) computer employs a multiplexer (46) and a coupler (48, 50). The first (MC, 30) and second (SC) computers have a first (LA/B, LEX0-15) and second (CX1-21, CA1-15) plurality of information lines, respectively. These computers also each have a group of control lines (36, 42). The multiplexer (46) is connected to the first and second plurality of information lines (LA/B, LEX0-15, CX1-21, CA1-15). The multiplexer (46) is operable to separately switch each of a predetermined group (LEX12-15) within the first plurality (LA/B, LEX0-15) between either member of a different corresponding pair within the second plurality (CX1-21, CA1-15). The multiplexer (46) is also connected to at least one (ESELCX) of the control lines (36) of the first computer (MC, 30). The multiplexer (46) can switch the predetermined group (LEX12-15) in response to a signal on the control lines (ESELCX) of the first computer (MC, 30).

Abstract: A link (10) exchanges data between a master (MC) and slave (SC) computer. Each computer has control lines (26A, 42) and incompatible information lines (26B, 26C, CA1-15, CX1-21). The master computer (MC) includes a master interface (28) connected to the information and control lines (26) of the master computer (MC). The master interface (28) has separate intercommunication lines (LA/B) and intermediate (34) lines. This master interface (28) is able to provide an intermediate signal on its intermediate lines (34) in response to signals provided by the master computer (MC) on its control lines (26A). The link (10) includes a computing subsystem (30) and a slave interface (38). The computing subsystem (30) is connected to the intercommunication (LA/B) and intermediate (34) lines of the master interface (28). The computing subsystem (30) has command lines (36) for providing thereon a command signal in response to the intermediate signal.