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Processor PCB
Table 2-8 Parallel Printer Controller Instruction
INSTRUCTION
READ/
I/O ADDRESS
DATA BUS
WRITE
7
6
5
4
3
2
1
0
Write Signal 0
W
6E
I
0
0
1
0
1
0
0
I
Write Signal 1
W
6E
0
0
0
0
0
I
0
N
T
E
R
Write Signal 2
W
6E
0
0
0
0
0
1
I
M
S
M
Write Signal 3
W
6E
0
0
0
0
1
0
0
A
S
K
Write Signal 4
W
6E
0
0
0
0
I
1
I
I
R
T
-
M
Write Signal 5
W
6C
I
X
X
A
X
X
X
X
P
S
K
-
S
F
E
R
+
A
L
D
P
Read Signal
R
68
5
0
0
U
E
0
R
E
V
L
C
Q
T
T
D
D
D
D
D
D
D
D
A
A
A
A
A
A
A
A
Write Data
W
6A
T
T
T
T
T
T
T
T
A
A
A
A
A
A
A
A
8
7
6
5
4
3
2
I
2-35
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