Appeal No. 1995-3903 Page 14
Application No. 08/062,737
The third task 216 is the SCSI interrupt service routine
(SCSI_ISR). It is initiated by a low priority interrupt,
which is asserted when a command has been received through the
interface controller from the host. Id. at ll. 48-52.
The microprocessor spends approximately the first 300
microseconds of every sector interval executing POS-ISR. The
remaining approximately 212 microseconds of each sector find
the microprocessor executing Main Time to do housekeeping, to
wait for an interrupt, or to respond to an interrupt by
executing SCSI_ISR. Id. at ll. 52-60.
The appellants erred in reading limitations from their
specification into the claims. Comparison of Moon’s
disclosure to the claim language evidences that the reference
would have suggested the claimed scheduling of tasks to
maintain their initiation in a constant spatial relationship
to a sector period. Moon’s Main Time and POS_ISR tasks would
have suggested the claimed tasks. The reference’s initiation
of POS_ISR at the beginning of each sector interval and its
initiation of Main Time after POS_ISR is completed would have
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