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Diagnostic Controlled IMPL Disclosure Number: IPCOM000055889D
Original Publication Date: 1980-Sep-01
Included in the Prior Art Database: 2005-Feb-13

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Alcock, EW Crabtree, MR McRoberts, RS Tetzlaff, W [+details]


Computer systems having a central processing unit implemented with a microprocessor require an initial microprogram load (IMPL) for processing system programs. If there are hardware problems in an I/O device dedicated to the IMPL function, it is not always possible for diagnostics to identify the problem. A program-controlled IMPL is provided for analyzing the problem. A diagnostic supervisor is loaded into the CPU through an alternate load I/O device. The program IMPL request is then generated. When the program controlled IMPL terminates abnormally, the diagnostic supervisor can interrogate the load device status information and locate the failing field replaceable unit.