Browse Prior Art Database

Clear Operation for Buffered Card Punch

IP.com Disclosure Number: IPCOM000076774D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Ferreri, V: AUTHOR [+4]

Abstract

The circuit of the drawing clears cards from the transport mechanism of a buffered card punch. The buffered punch does not have the mechanical apparatus for identifying the card position, as in the familiar unbuffered punch, and the circuit senses the position of a card at the read-punch station from control bits called "flags" that are written into character positions of the buffer. When the operator of the card punch closes a keyboard switch that energizes a line 2, a latch CLEAR is set. CLEAR and timing signals at an AND gate 3 set latches READ ACTIVE and READ/PUNCH CARD LEVER. The signal NOT COL 82 signifies that a previously registered card of 80 columns has not advanced out of the read-punch station, and the signal CF2 identifies a particular point in the card feed cycle.

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Clear Operation for Buffered Card Punch

The circuit of the drawing clears cards from the transport mechanism of a buffered card punch. The buffered punch does not have the mechanical apparatus for identifying the card position, as in the familiar unbuffered punch, and the circuit senses the position of a card at the read-punch station from control bits called "flags" that are written into character positions of the buffer. When the operator of the card punch closes a keyboard switch that energizes a line 2, a latch CLEAR is set. CLEAR and timing signals at an AND gate 3 set latches READ ACTIVE and READ/PUNCH CARD LEVER. The signal NOT COL 82 signifies that a previously registered card of 80 columns has not advanced out of the read-punch station, and the signal CF2 identifies a particular point in the card feed cycle. The coincidence of CLEAR and READ ACTIVE and the signal NOT COL 82 sets latches CLEAR FLAGS, READ, and DATA LOAD. These latches load flags into the buffer for controlling the normal operation of advancing a program card through the read-punch station, to write a program into the buffer. CLEAR is applied to circuits, not shown, to prevent the data on a card from actually being written into the buffer during a clear operation. Thus, a card at the read-punch station is advanced at high speed as in a program load operation.

When the card at the read-punch station has been cleared, READ ACTIVE and READ/PUNCH CARD LEVER are reset in response to the coincid...