Computer Diagnostic Control Circuitry
Original Publication Date: 1988-Dec-01
Included in the Prior Art Database: 2005-Feb-15
A technique is described whereby a single diagnostic control circuit card can interface up to four processors during diagnostic computer testing operations. Described is the circuit and operation which reduces and simplifies the diagnostic control circuitry which previously required four circuit cards. (Image Omitted) The purpose of the diagnostic control card (DCC) is to convert signals generated from a processor under test and present them to a "burn-in" unit under test (UUT) circuit card. The UUT card monitors "test good" indicator (TGI) lines from the DCC to determine whether the card under test is still operating. A high-to-low transition on a TGI line indicates that the processor and its associated storage cards are operating successfully. Each DCC can interface up to four clusters.