Floppy disk controller with means to change clock rate automatic

Details Floppy disk controller with means to change clock rate automatic Floppy disk controller with means to change clock rate automatic

1983-04-22

1989-10-03

Shaw, Gareth D.

Boots, shoes, and leggings

3642481, 364265, 3642655, 3642706, 371 7, 371 61, G06F 1312

Patent

active

048721077

ABSTRACT:
A processor and disk controller are arranged to operate with either of two types of disk drive, a drive for a five and one-fourth inch disk or a drive for an eight inch disk, and a method and apparatus are provided to test a port to detect which type disk is connected. The disk drives do not directly signal their type, and in one operation this information is derived from "drive ready", signals that are supplied separately by each disk type. In an alternative method and apparatus, this information is derived by a test in which the clock speed is changed.

REFERENCES:
patent: 3950735 (1976-04-01), Patel
patent: 4007448 (1977-02-01), Sergeant et al.
patent: 4095267 (1978-06-01), Morimoto
patent: 4217637 (1980-08-01), Faulkner et al.
patent: 4494196 (1985-01-01), Greer
Grofton, Peter W., "Mastering Serial Communications", Sybex, pp. 2-3.

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