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TABLE
2-1.
CONTROLS AND INDICATORS (CONT'D)
Control or Indicator
Function
ONLINE/NOIOOU./
WRITE PROTECT
switch (Cont'd)
CHECR
switch/indicator
+5, -5, +20, -20,
and
GND
test jacks
Bidirectional Data
Line bit indicators
DISPLAY SELECT
switch
ONLINE/NORMAL/
WRITE PROTECT switch
83318200
A
Logic Chassis Maintenance Panel (Cont'd)
OFFLINE-WRITE PROTECT position causes same occurrences as
for OFFLINE-NORMAL position and additionally disables the
write circuits.
Switching from OFFLINE to ONLINE causes an internal
General Reset (equivalent to DIN).
Indicator lights in response to one or more of the same
conditions as listed for the operator panel CHECK
.swi tch/ indica tor.
Pressing the logic chassis maintenance panel CHECR
switch clears the Pack Unsafe FF and all bits of DSBI,
DSB2,
and
DSB3.
Provide a point at which dc voltages in logic chassis can
be measured.
They must not
be
used as a power source.
Display information is selected by DISPLAY SELECT switch
when in Offline mode.
Indicator lights if selected signal
is true.
Ten position rotary switch that allows selection and dis-
play of machine ·status and register contents.
Switch
positions function as follows:
1. ADDRESS VERIFY is used only in conjunction with Off
Line Tester.
Tester operation stops if it detects
difference between cylinder byte read from disk and
contents of Cylinder Address register.
Indicators
display address read from disk.
Error may be verified
by setting switch to DSB4.
Bit
26
(Tester Address
Error) will
be
on.
ONLINE position places unit under control of control
unit.
OFFLINE - NORMAL position causes the following:
1. Prevents control unit from initiating a seek or
read/write operation.
2. Enables control of drive functions by Off Line
Tester.
3. Lights LOCAL indicator.
4. Clears reserved status of drive, inhibiting
gating of status signals (including OPI to
controller.
2-3
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