Browse Prior Art Database

Error Localization

IP.com Disclosure Number: IPCOM000096653D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Heassler, RA: AUTHOR [+2]

Abstract

The location of an error is determined by ex changing the functions of similar circuits.

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Error Localization

The location of an error is determined by ex changing the functions of similar circuits.

A data processing system DPS is connected to a Teletypewriter TTY unit by a telegraph line and to an input/output I/O device by four lines. Scanners permit four data processing system lines, receive data, receive control, send data and send control, to be time-shared by a plurality of TTY units and I/O devices, one of each being shown.

And (&), Or (O) and Invert (I) circuits are appropriately labeled. Triggers T are set to the values present at their inputs.

Each telegraph line is attached to the DPS by two pairs of relays and scanners. When signal RDA-RCB is supplied, as a function of DPS signals, read relay RA is connected via receive scanner A to the DPS receive data input. Also, read relay RB is connected via receive scanner B to the DPS receive control input. An RDB-RCA input reverses the functions of the relays and the scanners so that read relay RB is connected via receive scanner B to the DPS receive data input. Also, read relay RA is connected via receive scanner A to the DPS receive control input. In both the RDA-RCB and RDB-RCA cases, the DPS send data and DPS send control lines are connected to both send relays SA and SB.

In the TTY case, the RDA-RCB signal occurs when the control line carries a 0 bit, while the RDB-RCA signal is a result of a 1 bit on this line. The RDA-RCB and RDB-RCA signals can also be provided during the I/O send operations...