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The losing SCSI device waits for the SEL signal to become true
before releasing the BSY signal and SCSI ID bit when arbitration
is lost.
The losing SCSI device returns to Step 1. If no higher priority
SCSI ID bit is true on the DATA BUS, the SCSI device wins the
arbitration and asserts the SEL signal.
The winning SCSI device waits at least one bus clear delay plus
one bus settle delay after asserting the SEL signal before changing
any signals.