John P Foote

US Patent:

45731527, Feb 25, 1986

Filed:

May 13, 1983

Appl. No.:

6/494323

Inventors:

Richard E. Greene - Norwalk CT
Gladstone F. Young - Redding CT
Gary E. Tom - Bethel CT
Harry G. Schaffer - Westport NY
John S. Foote - South Salem NY

International Classification:

G06F 1100
G01R 3128

US Classification:

371 22

Abstract:

A switch matrix system is described with which peripheral devices can be conveniently tested for compatibility with central processor units. A diagnostic channel is provided to which a peripheral device to be tested is connected at a crosspoint in the switch matrix system. A control provides a sequence of signals needed to establish data communication between the central processor unit and the peripheral device. Errors or failures in the sequence are detected and stored and displayed with a terminal from which the switch matrix system is operated. Additional testing is done by generating bit test patterns and comparing the returns with those sent out. A channel activity monitor is employed in the switch matrix system to enable a comparative review of activity of channels from different central processor units.