Browse Prior Art Database

Tape to Printer

IP.com Disclosure Number: IPCOM000092558D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Grapentine, WG: AUTHOR

Abstract

The tape to printer unit can be used to allow an operator to inspect data that is recorded on magnetic tape from a data source such as a computer or tester.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 73% of the total text.

Page 1 of 2

Tape to Printer

The tape to printer unit can be used to allow an operator to inspect data that is recorded on magnetic tape from a data source such as a computer or tester.

In this application, a tape is read while going backwards until a tape mark is recognized to initiate further action. Normal recognition of a tape mark is done while reading forward, where the circuitry for recognition looks only at the first character of a record and decides if this character is a tape mark.

While reading backwards, the first character read is the check character. Since the tape mark record is a single record, the check character often has the same bit configuration as the tape mark character. The normal tape mark circuitry finds no difference in recognizing the tape mark while going forward. However, while going backward a problem occurs when a normal record has a combination of characters that give the check character a bit structure equal to the tape mark. Under these conditions the first character read while going backwards is recognized as a tape mark, when actually this is not a tape mark record. This device corrects this problem.

In operation, the output from the normal tape mark circuitry 6 when actuated fires single-shot 1 for five milliseconds. The single-shot output gates character gate 9 feeding gated line 10 to a two-position counter 2a and 2b. When the counter is pulsed twice, its output 13 is active and remains in this condition until the end of the operation....