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Bit
ALO
Position
Title
Description
· - - - - i
KH321
0
PASS
Turned on by a successful FLT test execution.
----·
KH321
1
FAIL
Turned on by a failing FLT.
KH211
2
BINARY TGR
Turned on or off for each goad comparison. For a successful test, the light will re-
turn to its initial off state.
KH31 l
3
TEST CNTR ; 0
Indicates a test has been executed 16 times (normal operation).
KHlll
4-9
FLT OP REG
Six indicators display the FLT op register, which is used for decoding FLT operation
routines.
KH341
10-12
SEQ CNTR
The three-position sequence counter is used for control during FLT load and for clock
advance during FLT execution.
KH345
13-16
SEQ STAT
Indicates the four
sta~
that are used in conjunction with the sequence counter during
FLT load.
KH555
17
FLT LOAD CHK
Indicates o detected
parity
error in an unsuccessful FLT load.
KH321
18
SUPV STAT
Supervisory stat on allows the sequence counter to be decremented.
KH321
19
PROGSV SCAN STAT
Progressive scan stat on causes a return to main storage for control or scan information
during execution of the diagnose instruction.
(Normally off during FLT execution.)
KH321
20
SUPV ENABLE STOR
Supervisory enable store on disables the storage inhibit function of the supervisory
stat during execution of the diagnose instruction.
(Normally off during FLT execution.)
t----·
KT151
21
SEQ CNTR MODE
Indicates the CPU is under sequence counter control.
KT151
22
MAIN STOR MODE
Indicates the CPU is under main storage control.
KT151
23
ROS MOOE
Indicates the CPU is under ROS control.
24
ALT PREFIX
Indicates the state of the prefix trigger (this indicator is part of the multisystem
feature).
KT16 I
25
HARD STOP
Indicates the four clocks are stopped due to an error.
r-·
Indicates an error condition when a log out is to
be
initiated.
KT151
26
LOG TGR
KH231
27
BLOCK INOIC
Block indicators is on when a bit in the FLT op register indicates that the information
d!~played !!~the
status !nd!coto" !s
~ot
beirig gnterl
hy
th~ ~el~<"t ~wikhes.
(At
'"~h
times the force indicators key lever switch may be used.)
KT271
28
SINGLE CYCLE
Indicates when the CPU is in single cycle made, or if the rote switch has been turned
off single cycle but the start switch has not been pressed.
KT215
29
CPU CLOCK
On when the CPU clock is running.
KT211
30
CHAN CLOCK
On when the
1/0
clock is running.
n211
31
ROS CLOCK
On when the ROS clock is running.
KT211
32
MAIN STOR CLOCK
o·n when the main storage clack is running.
KT161
33
CHK IRPT ENABLED
Check interrupt enabled is
on
whenever an error interrupt is possible.
KT16 I
34
CHK REG GATED
Check register gated is on whenever the error register is gated.
KT081
35
CHK PEND
The check pending trigger is set at the time the error register is set if PSW 13 is
masked off. Upon unmasking, this trigger causes a log out and machine-check
interrupt.
FIGURE 169. MAINTENANCE CONTROL INDICATORS
Appendix B--System Control Panel
(3/71)
183
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