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Maintenance Panel Operating Procedures
CENTRAL DATA BUS
7
8
10
13
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
MCUD
MCUD
DATA
SYSTEM
SYSTEM
TO
TO
TO
FROM
FROM
FROM
MOP
MOP
CPU
CPU
CPU
PARITY
PE
PE
PE
PARITY
0
1
2
0
I
2
a
1
LORD
HIRD
SELECT
0
0
0
0
I
0
I
0
0
0
0
0
0
0
0
0
0
0
I
READY
READY
READY
READY
READY
READY
READY
ENABLE
ENABLE
ENABLE
ENABLE
ENABLE
ENABLE
I/O
I/O
I/O
0
1
2
3
4
5
6
a
1
2
3
4
5
LORa
HIRD
SELECT
0
0
0
0
0
0
0
I
0
0
0
0
0
0
I
0
0
0
I
Table 3-1. Maintenance Panel Controls and Indicators
PANEL
ROW
PANEL MARKING
USE
1
CENTRAL DATA BUS
These lamps display the data word which is on the central data
°
through 15 (lamps)
bus (MCUD 0:15).
2
MCUD PARITY (lamp)
Indicates the state of the CTL bus parity bit.
2
MCUP PE (lamp)
Indicates a parity error has been detected on the CTL bus.
2
DATA PE (lamp)
Indicates there was a parity error detected in the data received by
the CPU from memory.
2
SYSTEM PE (lamp)
Indicates a parity error was detected in the information transferred
on the TO, FROM, MOP, and SYSTEM PARITY lines.
2
SYSTEM PARITY (lamp)
Indicates the state of the parity bit generated from the TO, FROM,
and MOP codes.
2
TO 0, TO 1, TO 2
Display the address for which the word on the CTL bus is intended.
(lamps)
2
FROM 0, FROM 1
Display the address of the module from which the word on the CTL
FROM 2 (lamps)
bus is being sent.
2
MOP 0, MOP 1 (lamps)
Display the memory operation code. This code is used by the
addressed memory module.
2
CPU LORO (lamp)
Indicates the CPU is issuing a low priority request for a transfer to a
module.
2
CPU HIRO (lamp)
Indicates the CPU is issuing a high priority request for use of the
CTL bus.
2
CPU SELECT (lamp)
Indicates the CPU is currently selected to use the CTL bus.
3
READY
°
through 6
Display the module ready lines. Each line is associated with a like
(lamps)
numbered module, and when true, indicates the module is ready
to receive a transfer.
3
ENABLE
°
through 5
Display the module enable lines. Each line is associated with a like
(lamps)
numbered module, and when true, indicates a module is trans-
ferring data. The enable lines are monitored by the modules to
resolve priorities.
3
I/O LORO (lamp)
Indicates the lOP is issuing a low priority request for use of the CTL
bus.
3-3
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