Burroughs, Inc.

Jayesh V Sheth

David Jon Mortensen

Glenn T Hotchkin

A peripheral-controller (called a Data Link Processor) optimizes the rate of data transfers between a host computer and magnetic tape peripherals by use of a block counter sensing system for monitoring the occupation-status of word-blocks in a buffer memory. The peripheral-controller provides Automatic Read/Write Logic for buffer-peripheral tape transfers and a burst mode routine for rapid host-buffer transfers of data words. The sensing system provides means to inform a microcode sequencer when certain action routines should be executed in order to maintain steady error-free data transfer operations which minimize the need for retries of data transfer cycles previously initiated.

System for regulating data transfer operations

A peripheral-controller is used to manage data transfers between peripheral units of the magnetic tape type. A program sequencer in the peripheral-controller can signal an automatic read-write selection logic and control unit to operate in the 'automatic read' mode whereby an automatic read-logic unit will transfer data out of the magnetic tape peripheral unit into a buffer memory of the peripheral-controller on a continuous basis without further instructions being required from the program sequencer.

Automatic read system for peripheral-controller

A block counter sensing system for monitoring the occupation-status of word-blocks in a buffer memory of a peripheral-controller having Automatic Read/Write Logic for buffer-peripheral tape transfers and a burst mode routine for rapid host-buffer transfers of data words. The sensing system provides means to inform a microcode sequencer when certain action routines should be executed in order to maintain steady error-free data transfer operations which minimize the need for retries of data transfer cycles previously initiated.

Block counter system to monitor data transfers

A data transfer system for transferring data from magnetic tape peripheral units to a peripheral-controller for temporary storage and subsequent transfer to a host computer. A tape control unit, connected to the magnetic tape peripheral units, provides clock signals to a synchronization logic circuit which controls the transfer of data through two sequential latching registers to a buffer memory in the peripheral-controller. The two sequential latching registers function as a buffering delay element together with an automatic read logic unit which allows the read logic unit to use a lesser number of cycle-steal times than would ordinarily be required, while still controlling a steady uninterrupted flow of data words.

Transfer rate control system from tape peripheral to buffer memory of

A peripheral-controller (designated as a data-link-processor) manages data transfers between a main host computer and a magnetic tape peripheral unit. The peripheral-controller uses a common front end providing an instruction sequencing unit and a buffer memory to store data-in-transit in six blocks of 256 words each. A peripheral-dependent circuit unit of the peripheral-controller can provide automatic read or automatic write data transfers between the buffer memory and the magnetic tape peripheral unit without further attention from said instruction sequencing unit.

Magnetic tape-data link processor providing automatic data transfer

A data transfer system whereby a peripheral-controller manages data transfers between the host computer and a magnetic tape peripheral unit. Data undergoing transit, is temporarily stored in a buffer memory of the peripheral-controller and is monitored by a block counter monitoring system which informs a program-sequencer in the common control circuit unit of the peripheral-controller when data may be shifted into or out of the buffer memory in order to avoid or reduce the probability of access error conditions.

Burst mode data block transfer system

A peripheral-controller is used to manage data transfers between magnetic tape peripheral units and a main host computer. A program sequencer in the peripheral-controller can initiate an automatic read-write selection logic and control unit to operate in the 'automatic write' mode whereby an automatic write-logic unit will transfer data out of a buffer memory in the peripheral-controller and into a magnetic tape control unit on a continuous basis without further instructions being required from the program sequencer.

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El Toro, CA, United States of America

Jayesh V Sheth