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Table 5-1. Microprocessor Input Ports - continued - TM-11-5865-215-130039
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TM-11-5865-215-13 Receiver Control C-10026/USQ NSN
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Table 5-1. Microprocessor Input Ports - continued - TM-11-5865-215-130041
TM 11-5865-215-13
Microprocessor Input Ports - Continued
Table 5-1.
Output
control
(OC) bits
Input
Associated
Function
port
3210
hardware
0101
Permits the microprocessor to identify which
5
Front
front panel key is pressed.  This port de-
panel
fines one of 4 possible columns as the loca-
keyboard
tion of the pressed key.  Further identifica-
tion depends on the keyboard row previously
selected by output port O (see port O on
table 5-2).
IB53 IB52 IB51 IB50
No key in columns
1
1
1
1
5, 6, 7 or 8 is
pressed.
A key in column 5
1
1
1
0
is pressed.
A key in column 6
1
1
0
1
is pressed.
A key in column 7
1
0
1
1
is pressed.
A key in column 8
0
1
1
1
is pressed.
Permits microprocessor to identify which
6
Front
0110
front panel key is pressed.  This port de-
panel
fines one of 3 possible columns as the loca-
keyboard
tion of the pressed key.  Further identifica-
tion depends on the keyboard row previously
selected by output port O (see output port O
on table 5-2).
Meaning
IB63 IB62 IB61 IB60
No key in columns 9,
1
1
1
1
A or B is pressed.
1
1
1
0
A key in column 9
is pressed.
A key in column A
1
1
0
1
is pressed.
A key in column B
1
0
1
1
is pressed.
5-7

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