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6.4.4
Error Register 2
BIT 11
LOSS OF SYSTEM CLOCK (LSC)
LSC indicates one of two problems.
1.
With the
~Go"
Bit
reset,
System clock
transition are
absent longer than 3usecs.
2.
With
the
"Go"
Bit
set,
there
is
an
absence
of
Prom
address changes.
3.
Wi th the "Go" Bi t set and Bi t clock di sappears, LBC and
LSC will both be set.
Diagnostics
11/7"
Same as Loss of Bit Clock
Drive
See LBC if LBC is set.
6.4.5
Error Register 2
VAX
Same as Loss of Bit Clock
RM Adapter
M7684
M7686
M7687 if LBC set
BIT 12
INVALID COMMAND (IVC)
lVC indicates that "Volume Valid" or "Unit Ready" is not
asserted when any command except "Read In Preset" or" Pack
Acknowledge" is attempted.
Diagnostics
11/7"
CZRMP Diskless 1
CZRMQ Diskless 2
CZRMM Functional 1
CZRMN Functional 2
Drive
A17, A"l
Cable
6.4.6
Error Register 2
VAX
EVRDA Diskless
EVRDB Functional
RM Adapter
M7684
M7686
BIT 13
OPERATOR PLUG ERROR (OPE)
OPE indicates the drive address plug is removed.
5"
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