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A plurality of information handling units communicate asynchronously via a common bus using a single signal line. Each information handling unit includes a self-control type bus utilization unit connected to the signal line and operative to connect the common bus to an internal bus of the informatio

A plurality of information handling units communicate asynchronously via a common bus using a single signal line. Each information handling unit includes a self-control type bus utilization unit connected to the signal line and operative to connect the common bus to an internal bus of the information handling unit. This unit includes an own name address generator responsive to a bus request signal for outputting the address of the information handling unit, the address being encoded according to that information handling unit\s priority among the plurality of information handling units. Transmission gates couple the address to the common bus, and a decision unit compares a signal on the common bus and the address to make a decision based on the assigned priority of the information handling unit to derive a bus grant signal. This signal and a bus available signal on the single signal line are used to derive a signal to drive transmission gates that couple the common bus to the internal bus.

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An information handling unit comprising: a bus terminal coupled to a common signal bus for transferring and receiving an information signal to and from said common bus; an internal signal bus; an address signal generator generating an own name address signal; a single control terminal coupled to a s

An information handling unit comprising: a bus terminal coupled to a common signal bus for transferring and receiving an information signal to and from said common bus; an internal signal bus; an address signal generator generating an own name address signal; a single control terminal coupled to a single control signal line separate from said common signal bus for transferring and receiving to and from said single control line a control signal indicating non-utilization of said common signal bus by an information handling unit; a bus available signal generator directly coupled to said single control terminal and generating a bus available signal indicating availability of the common signal bus utilization in response to said control signal received from said single control terminal and when said information handling unit needs to utilize said common signal bus; a gate coupled between said address signal generator and said bus terminal, said gate transferring said own name address signal to said bus terminal in response to said bus available signal generated by said bus available signal generator; a transfer line connected to said bus terminal and transferring a name address signal received at said bus terminal; a comparison means coupled to said address signal generator and said transfer line for comparing said own name address signal with said name address signal received via said transfer line; means for generating a grant signal indicating grant of the common signal bus utilization in response to the result of a comparison in said comparison means; and a control signal generator generating the own control signal indicating non-utilization of said common signal bus by the own information handling unit when said grant signal is not generated, the output of said control signal generator being directly coupled to said single control terminal, whereby said single control signal line always indicates utilization or nonutilization condition of said common signal bus by any information handling unit, and said bus available signal generator always detects the condition of said single control signal line.