Electrical computers and digital data processing systems: input/ – Input/output data processing – Flow controlling
Reexamination Certificate
2003-06-26
2010-11-16
Patel, Niketa I (Department: 2181)
Electrical computers and digital data processing systems: input/
Input/output data processing
Flow controlling
C710S057000, C365S236000
Reexamination Certificate
active
07836222
ABSTRACT:
An apparatus which uses channel counters in combination with channel count read instructions as a means of providing information that data in a given channel is valid or has not been previously read. The counter may also, in the situation of the channel being defined as blocking, be used to prevent the unintentional overwriting of data in a register used by the channel or, alternatively, prevent further communications with the device assigned to that channel when a given count occurs. Intelligent external devices may also use channel count read instructions sent to the counting mechanism for reading from and writing to the channel.
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Day Michael Norman
Flachs Brian King
Hofstee Harm Peter
Johns Charles Ray
Liberty John Samuel
International Business Machines - Corporation
Patel Niketa I
Talpis Matthew B.
Unelus Ernest
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