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Dual Usage Counter

IP.com Disclosure Number: IPCOM000081211D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Books, AK: AUTHOR

Abstract

A counter is operated from a first-time base to perform a first timing function, and then is operated from a second unrelated time base to provide a second timing function. This arrangement is particularly useful for card readers and like devices which, require particular timing signals for their operation.

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Dual Usage Counter

A counter is operated from a first-time base to perform a first timing function, and then is operated from a second unrelated time base to provide a second timing function. This arrangement is particularly useful for card readers and like devices which, require particular timing signals for their operation.

Counter 10, Fig. 1, is first used for setting latch 15 to indicate that the card reader motor, not shown, has reached running speed whereby cards can be fed. As the card reader motor is coming up to speed, counter 10 is advanced by FCB1 emitter pulses occurring once every card feed cycle. The FCB1 emitter pulses are applied to counter 10 via AND circuit 20 and OR circuit 25. AND circuit 20 is conditioned by a Motor FL signal which results in response to starting the card reader. Inverter 21 conditions AND circuit 20 by inverting the output of latch 15. Latch 15 is initially reset via inverter 16 by the Motor FL signal and is set when counter 10 counts eight FCB1 pulses.

The Motor Ready signal provided by latch 15 indicates that a card can be fed through the card reader. Counter 10 is reset by a FCB1 pulse via AND circuit 30 and OR circuit 35, as the Motor Ready and CR Busy signals condition AND circuit 30. The CR Busy signal indicates that the card reader is busy.

After counter 10 is reset, it is advanced by Reader Clock A pulses via AND circuit 40 and OR circuit 25. AND circuit 40 is conditioned by the CR Busy signal and by a Pre Rd SC EXP...