The Slot 0 P3 LBUSA and LBUSC keys SHALL indicate ECL class.
RULE B.6.84:
The mainframe (if it supports VXIbus Subsystem P2) SHALL provide a Slot 0 P2
LBUSC key which indicates TTL class.
RULE B.6.85:
The mainframe (if it supports VXIbus Subsystem P3) SHALL provide a Slot 0 P3
LBUSC key which indicates ECL class.
PERMISSION B.6.2:
A device which non-destructively senses signals up to ±16 volts, but does not source
any signals (or provide direct connection between LBUSA and LBUSC) MAY provide
a single local bus key tab for ±16 V sensor-only operation.
PERMISSION B.6.3:
A device which non-destructivel
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