Diskette subsystem fault isolation via video subsystem loopback

Details Diskette subsystem fault isolation via video subsystem loopback Diskette subsystem fault isolation via video subsystem loopback

1982-11-30

1987-05-19

Shaw, Gareth D.

Excavating

371 25, 371 27, G01R 3128

Patent

active

046673296

ABSTRACT:
A data processing system includes a cathode ray tube (CRT) display subsystem and a floppy disk subsystem. The logic of both systems are verified by generating and transferring a fixed format stream of data bits from the CRT display subsystem to the floppy disk subsystem in modified frequency modulation (MFM) mode and checking the information received by the floppy disk subsystem against the original information presented to the CRT display subsystem.

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T. H. Miller et al., "Programmable Loop-Back Read Diagnostic for Disk Drive", IBM Technical Disclosure Bulletin, vol. 14, No. 8, Jan. 1972, pp. 2272-2273.

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