Abstract: A host structure is provided for terminal adapters that are part of a distributed computer architecture. Each computer system is in turn connected to a number of synchronous or asynchronous terminals via the network and terminal adapters, each terminal adapter connected, on one hand, to the network and, on the other hand, to at least one terminal via a synchronous or asynchronous transmission link. The host structure can contain a number of adapter cards, each containing the electronic circuit of an adapter, and is composed of a first compartment with the adapter cards, and a second compartment with an equal number of connection cards. The connection cards each enable connecting a number of terminals to a particular adapter.

Abstract: A multifunctional coupler for connecting a central processing unit of a computer to one or more peripheral devices and for storing at least one portion of an application microprogram that is operative to control transfer of data between a peripheral and the CPU. The coupler includes a mother-board with at least a first and second interface for connecting an output bus of the CPU to at least first and second daughter-boards, respectively. The mother-board also includes a control and command microprocessor that is connected to both the first and second interfaces, a RAM and a first ROM, all connected to an output bus of the microprocessor. The daughter-boards each include a second ROM for storing an application microprogram that includes a first program segment common to all application microprograms run by the microprocessor, that is read from the first ROM, and a second segment that is read from a second ROM, the second segment being specific to a particular application executed by a peripheral.

Abstract: A communications controller is provided that allows transfer of a large number of frames to each of the channels of an S.sub.0 -type link to be handled simultaneously at a data transfer rate matched to that of the link. The communications controller is connected between a bus associated with at least one host computer and the terminals of a network connected by a time-multiplexed digital link. The communications controller includes a base unit connected to the bus for managing and effecting the transfer of frames for the link, and a peripheral unit connected to the base unit and to the network.