IBM System/360 Operating Guide

CHANNEL NUMBER TWO
I
DATA REGISTER
I
KEY I COMMAND I
I
P
I
8
4 2
1
, 8
4 2
~ I
P I 8
4
2
1
I
8 4 2 1
I
P
0
1
2
3 4
5 6
P 0 1
2
3 4
5 6
7
flAGS
I
TAGS
I
CHECKS
CD CC
Sli SKIP
PCI
I
OP
ADR STAT
SERV
I
IL
PROG
PROT CHNL CHNL INT
IN
IN
IN IN
DATA CTRL
FACE
SEL
ADR CMND
SERV
SUP
OUT
OUT
OUT
OUT
OUT
I
MPX
CHANNEl TAGS
I
MPX (~HANNEL BUS - OUT RECiISTER
OP
ADR STAT
SERV
SEl
ADR
CMND
SERV
SUP
I
P 8
4 2
1
8 4 2 1
IN
IN IN
IN
OUT OUT
OUT
OUT
OUT
P 0 1
2
3
4 5
6 7
MAIN STORAGE ADDRESS REGISTER
I
P
I ~
4
2
~ I
8 4 2 1
P
I ~
4
2
; I
8
P
1 2
4
5
6
7
P
1
2
4
MAIN STORAGE DATA REGISTER I AlU
OUTPUT
P
I 8
4 2
d
8
4 2
1
I
I 8
4 2
1
18
B-REGISTER I
A-REGISTER
P
I ~
4 2
1
I 8
4 2
1
I
P
I
8
4
2
1
18
P
1
2
3 4
5
6
7
P 0
1
2
3 4
Figure 4. Console Display Indicators (Part 2 of 2)
Match. Some modes of operation require the use
of an exclusive OR match circuit. The match
indicator turns on whenever the compare address
in switches A, B, C, and D matches the contents
of either the Main Storage Address Register (MSAR)
or the Read-Only Storage Address Register (ROAR).
The position of the address-compare switch deter-
mines which of these registers is monitored, as
well as the system res panse to a match.
Allow Write. Whenever the allow-write indicator
is on, main or auxiliary storage has completed a
read operation, but not the corresponding write
operation. When this indicator is on, manual dis-
play and store operations of main or auxiliary
storage are not possible.
1050 INTV. This indicator is turned on when an
addressed IBM 1050 system device requires manual
intervention (out of cards, out of forms, etc). The
light is turned on only if the device was in run mode
at the time the intervention became necessary. The
1050 INTV light is turned off when the unit has been
MAIN
I
STOR
4 2
1
AUX
5
6 7
STOR
CPU STATUS
CPU CHECKS
EX
MATCH ~~~~
STOR
STOR
4
2 1
ADR DATA
1050
1050
B A
ALU
INTV
REQ
REG
REG
4
2
1
MPX SEL COMP ROS ROS
CTRL
5
6
7
CHNL CHNL MODE ADR SALS
REG
made ready ~ when that unit is re-addressed, or
by the 2030 System Reset or Load keys.
1050 REQ. This light turns on whenever the
operator presses the request key on the 1052. It
is reset when attention status is recognized by the
attachment and accepted into the unit status register.
MPX CHNL. Whenever a multiplexor channel share
request is recognized by the CPU, this light turns
on. This light turns off at the completion of the
share cycle.
SEL CHNL. This lamp is lighted whenever either
selector channel is using the read-only storage
(such as for a selector-channel chaining operation).
CaMP MODE. Whenever the system is operating
in compatibility mode, this light is on. This lamp
is turned on at the same time as the W3 lamp (the
W-register read-only-storage display bit-3 position
position--see Part 1 of Figure 4).
15

IBM System/360 Specifications

General

Brand	IBM
Model	System/360
Category	Desktop
Language	English