Firmware simulation of diskette data via a video signal

Details Firmware simulation of diskette data via a video signal Firmware simulation of diskette data via a video signal

1982-11-30

1986-12-23

Hoffman, James R.

Boots, shoes, and leggings

364200, 371 24, 371 25, 371 68, 371 71, G06F 1100

Patent

active

046316990

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.
The bit rate of the data stream is varied depending on the number of address locations used in the data RAM of the CRT display subsystem to store each data bit.

REFERENCES:
patent: 4148098 (1979-04-01), McCreight et al.
patent: 4268905 (1981-05-01), Johann et al.
patent: 4327408 (1982-04-01), Frissell et al.
Miller et al, "Programmable Loop-Back Read Diagnostic for Disk Drive" IBM Technical Disclosure Bulletin, vol. 14, No. 8, pp. 2272-2273, Jan. 1972.

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