Browse Prior Art Database

Decoder

IP.com Disclosure Number: IPCOM000096001D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Hanson, NI: AUTHOR

Abstract

This decoding system makes use of read-only memory techniques. In operating programs from one computer on another computer, it is necessary to decode the program's operation codes in terms of the This decoding system makes use of read-only memory techniques. In operating programs from one computer on another computer, it is necessary to decode the program's operation codes in terms of the new computer's operation codes.

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Decoder

This decoding system makes use of read-only memory techniques. In operating programs from one computer on another computer, it is necessary to decode the program's operation codes in terms of the This decoding system makes use of read-only memory techniques. In operating programs from one computer on another computer, it is necessary to decode the program's operation codes in terms of the new computer's operation codes.

To accomplish this function, the program's operation code XaYaZa is entered into register 10. This provides true and complement outputs from each register position to indicate the entered binary values. The computer's operation code is entered into register 12 which is identical in all respects to register 10. The comparison and identity determining functions are performed by a pair of data processing cards 14 and 16 arranged as a read-only memory.

The true and complement output lines from registers 10 and 12 are disposed over cards 14 and 16. Sense lines 18 and 20 pass beneath the cards and are common to identical rows in each. Each sense line is connected via amplifier 22 to inverter 24. The register output lines induce outputs on the underlying sense lines only at positions where the card is punched to allow a capacitive coupling between the lines. Each row is punched at all crossovers except those for which the row is to indicate a comparison. In other words, an output pulse is induced on a sense conductor associated with a specific ca...