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Browse Prior Art Database

ELPC Direct Readin Memory Drum

IP.com Disclosure Number: IPCOM000097533D
Original Publication Date: 1961-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Rice, R: AUTHOR [+2]

Abstract

The device reads punched hole tape directly into a computer memory drum without the use of any intermediary circuitry.

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ELPC Direct Readin Memory Drum

The device reads punched hole tape directly into a computer memory drum without the use of any intermediary circuitry.

Rotatable drum 2 has a plurality of electroluminescent photoconductor ELPC latches 4 mounted on its surface. These latches have the characteristic that once illuminated, they remain active, and produce light until the power supply to them is cut off. Conductors 8 and 16, which are connected to a suitable power source, provide power to the latches.

The punched hole tape 18 which is held by member 26 is indexed over a selected portion of the drum and then the light source 20 is turned on. Those ELPC latches beneath holes in the tape are activated by the light. The drum is then rotated and a different segment of the punched hole tape indexed over a different segment of the drum and the readin process repeated. In this manner, the information on the punched hole tape is read directly into the computer drum memory without the use of any intermediary circuitry.

Readout is accomplished by indexing that portion of the drum memory to which access is desired to the readout station 22. Readout station 22 is comprised of a plurality of photocells 24 which are positioned to correspond to the ELPC latches on the various segments of the drum 2. After a segment of the drum is indexed to the readout station 22, power is applied to the photocells 24. Those photocells 24, which are illuminated by active ELPC latches 4 on the drum, bec...