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Variable Readout

IP.com Disclosure Number: IPCOM000098243D
Original Publication Date: 1960-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Betts, WK: AUTHOR [+4]

Abstract

With this circuitry a variable readout operation is effected in a magnetic-drum type general-purpose electronic computer similar to the IBM Type 610 Computer by using the position of the decimal point in the Op Command Register in such a manner that it controls the number of digits that can be read out of a register.

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Variable Readout

With this circuitry a variable readout operation is effected in a magnetic-drum type general-purpose electronic computer similar to the IBM Type 610 Computer by using the position of the decimal point in the Op Command Register in such a manner that it controls the number of digits that can be read out of a register.

Conventionally, the data bits are recorded on the main storage portion of the drum in digit locations sequentially numbered 1 through 32. Clock pulses are generated in synchronism with the drum rotation so that the reading and recording in each digit location may be controlled. A data bit read from a digit location in main storage by Read Amp 1 is recorded in the buffer by Record Amp 2 without delay. This data bit appears at the Read Amp 2 thirty-one digit locations later with respect to time. Record Amp 1 is controlled so as to erase at all digit locations unless a data bit activates Record Amp 1. The data bit appearing at Read Amp 2 appears,at the Record Amp 1 without delay for recording in a main storage digit location. Conventionally, a data bit is shifted by one digit location for each complete cycle of data transfer from main storage to buffer storage and return to main storage.

By taking full advantage of the IBM Type 610 Computer and by adding one trigger circuit with associated diode and relay switching means, a variable readout operation can be performed. Normally, the IBM Type 610 reads out fifteen digits in the high half...