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7.2.2 IMPL-IPL Switches
The IMPL and IPL switches select the IMPL
(initial microprogram load) and IPL (initial pro-
gram load) devices. The IMPL and IPL devices
are the 62GV (disk) and the 33FD (diskette).
During normal operations both IMPL and IPL
are from the 62GV. When the LOAD switch is
pressed and released, control storage is loaded
with system diagnostic tests from the I MPL de-
vice. After successful completion of these tests,
the emulator and SCP (system control program)
are loaded. The microprogram then loads main
storage from the selected I PL device.
IMPL Switch
This switch selects the IMPL device. In the
DISK position, control storage is loaded from
the 62GV when the LOAD key on the operator
control panel is pressed. In the DISKETTE posi-
tion, control storage is loaded from the 33FD.
IPL Switch
The DISK position of this switch selects the
62GV as the IPL device. In the DISKETTE
position, IPL is from the 33FD.
D E
~F
0
1 \
D
E~F
0
' 2
3
DE
~F
0
' 2
3
DE
~F
0
1
PROC RUNl
2
INSN STEP/
• DPLY LSR
3
C
4C
4C
4C
4
B
5B
5B
5B
5
A
6
A
6
A
6
A
6
98
7
98
7
2
98
7
3
98
7
4
'------D I SP LA Y /DA T A _ _
---JI
'---------"' ......
-----ADDRESS/DATA----------~
DPLY PWR CHK
RESET
o
COMM
PWR
FORCE
DPLY
CHECK FAULT DPL Y CLOCK
IPL
IMPL
STO I SEL ADD CaMP
ON
RUN
PREV
ON
DISKETTE
DISKETTE
C L
STOP
0
0 0 0
0 0
0
OFF
STOP
PRES
OFF
DISK
DISK
MA N
RUN
CLOCK
PROCINTERRUPT
0
0 0 0
0 1 2 3 4 5 6 7
o
1
2
3
4 5 6
7
0000
0000
000
0000
8 4 2 1 8 4 2 1
8 4 2
8
4
2
~
.ALTERSTOR
• ALTER MAR
IRPT
• DPLY STOR
.INSN STEP/
DPL Y CHKS
·INSN STEP/
•
DPLY PCR
lsys
INSN STEP
MODE SELECTOR
CE START
o
DISPLAY
LA~ST '~Y
7-6
7.2.3 PROC INTERRUPT Lights
7.2.4 RESET Key
These lights indicate the current interrupt level
in progress. The interrupt is indicated in the
lights as follows:
Lights
Interrupt Level
4 2 1
X X X
o
(machine check)
X
1
X
2
Main!
X X 3
(optional features)
1
All lights off indicate main level.
Pressing this key causes the following to occur:
1.
The microprogram address register (MAR)
is initialized to hex 0000.
2.
Present power iault latches are transferred
to previous power fault latches and the
present power fault latches are reset.
3.
The processing unit timing circuitry is
initialized.
4.
Error and status indicators are reset.
5.
The PCR is initialized to the equal
condition.
6.
The 62GV is returned to track
O.
To restart the system, press either the CE START
key or the LOAD key.
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