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Address and Data Key Assignments
Address
~
H
n-11
21)
27
28
29
:!O
:n
Data
KL',\'
Function
!fold OTC Switch: This switch is not controlled
by either the manual switch or the enter push-
button; it is active when the rate switch is in
single c)·clc.
The hold OTC switch causes the
OTC line to channel to be held active after it
has onc.c been issued by ROS. To reset the
hold on the DTC, raise the switch.
IF stop. and Stop Select Switch: The 'IF stop'
switch (key
9)
determines which clock is to be
controlled. The stop select switches (keys
10-
11)
control the sequencing of the A-clock to the
tag gate generator.
These switches are gated to the interface
rc11;ister (making them active to stop the clock
at a certain position) by the enter pushbutton.
The manual switch is not a gating condition.
The stop select keys affect all selector
channels.
Keys
000
001
011
010
Keys
100
IOI
111
110
Request In
Address In
Status In
Service In
Select In
Operational In
Data
Stop on A-Clock
(No stop)
During clock AO
During clock Al
During clock step
Stop on Tag gate generator
(No stop)
During !TD! and not ITD2
During ITD2 and not ITD3
During ITDl and not 'In'
tag
0-7.
Parity
B.\te
0-::1.
Paritv
Word
To visually examine the contents of the adder latch,
(the B or C register of an idle selector channel) the
A-clock should not be stopped with the keys.
Stopping the sequence at any point or advancing
the sequence from one stop to another stop is
permissible.
A-Clock Stop: For proper single-step operation, the
A-clock sequence should be completed before the
start pushbutton is pressed for the next cycle. To
examine unit selection, stop the clock before the
third DTC in CCW2 routine is issued to the channel,
and sequence the A-clock with the keys from that
point through CC step 1 (clock Al of unit select). If
operating with a real unit, use tag gate sequencing
from that point to the end of unit select.
Tag Gate Generator Stop: When working with a real
I/O unit (manual op off) the check control switch
should be in the channel stop position to delay trans-
mission of the out tag. Stopping the sequences in
the data handling portions of the record may cause
overrun conditions in an unbuffered unit.
Enter
This pushbutton switch causes address and data key
information to be gated into the channels for manual
operation. The switch is active only in the manual
mode.
Selector Channel Display
This rotary switch selects one of the selector
channels for display in the status indicators. The
particular status word displayed is determined by
the position of the selector channel status roller
select switch.
Section G and K - Status Indicators
The status indicators on panel section G provide a
display of CPU and channel status. The 144 indica-
tors are arranged in four rows, 36 to a row. Each
row is separated in the center, with positions 0-1 7
in the left half and positions 18-35 in the right half.
Eight status words can be displayed in each row
of indicators. The desired word is selected with an
eight-position roller select switch. The switch also
positions a roller format to identify the information
displayed.
Panel section K is mounted to the right of the
status indicators to identify each row and the general
content of each word position.
The roller positions are explained in:
Figure*
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
Roller
Position
1/1
1/2
1/3
1/4
t/5
1/6
1/7
1/8
2/1
2/2
2/3
2/4
2/5
2/6
2/7
2/8
Content
Common Channel
I/O instructions
I/O routines
Control register
Multiplex Channel
Data buffers
Interface and control
Control triggers
(Special features)
(Special features)
Selector Channel
B-register
C-reglster
BC LW operations or checks
Position and request registers A-Clock
Interface and control
GP MP and flag registers
(Special features)
(Special features)
*
Located at end of this Appendix
Appendix B--System Control Panel
(3/71}
143
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