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Pneumatic Adder

IP.com Disclosure Number: IPCOM000096006D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Machmer, JA: AUTHOR

Abstract

This is one stage of a pneumatic, serial adder operative on numbers represented in binary notation. Logic elements cause the bistable, fluid jet amplifier 5 to switch with each augend, addend and carry pulse. A carry to a subsequent stage is recognized by an And which sees the 0 output and a delayed 1 output.

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Pneumatic Adder

This is one stage of a pneumatic, serial adder operative on numbers represented in binary notation. Logic elements cause the bistable, fluid jet amplifier 5 to switch with each augend, addend and carry pulse. A carry to a subsequent stage is recognized by an And which sees the 0 output and a delayed 1 output.

The device is a pneumatic, fluid jet amplifier. During addition, the single stage shown is initially reset. First, a carry pulse is received if a carry is generated at a low-order stage. Or 1 passes a signal on such a pulse and And 3 is satisfied also by amplifier 5. Amplifier 5 is thus switched on a carry. A pulse from the augend input next appears if a binary 1 is in the order of the augend which the adder stage acts upon. Such a pulse passes both Or's 1 and 7 and the And 3 or 9 is satisfied by amplifier 5 so that amplifier 5 is switched. An addend pulse next appears if a binary 1 is properly the addend. Amplifier 5 is switched by the same logic and structure as in the case of an augend 1.

A carry to a subsequent stage is recognized when amplifier 5 switches from a 1 output to a 0 output. Both outputs connect to And 11 with the 1 output, however, delayed by delay 13. An And condition thus occurs at And 11 only when amplifier 5 switches from 1 to 0 during addition, this being indicative of a carry.

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