Write control apparatus

G - Physics – 06 – F

Patent

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Details

352/19.4

G06F 9/26 (2006.01) G06F 9/22 (2006.01) G11B 20/12 (2006.01)

Patent

CA 1159143

SPECIFICATION OF STANLEY I. FRIEDMAN, CHARLES P. COBEEN AND HERBERT K. JACOBSTHAL FOR WRITE CONTROL APPARATUS ABSTRACT OF THE DISCLOSURE This relates to an apparatus for controlling the recording of data on magnetic tape in any one of the plurality of known formats; e.g. NRZI, PE or GCR each of which is comprised of special markers, characters and data records written at a pre- scribed sequence and for a predetermined length of time. A plurality of mini-programs each consisting of an ordered series of instructions are stored in a first programmable read only memory (PROM). A special marker or space is written by accessing the appropriate mini-program in this first PROM. A second programmable read only memory is likewise accessed and contains information indicative of the length of time which the corresponding instruction accessed from the first PROM is to be carried out. After each instruction is carried out for a pre- scribed period of time, an address counter is incremented to access the next instruction in the mini-program. 5202803

339095

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