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Processor PCB
ABOI
AB02
IORO
IOWO
CS
IRT
IRT71
RSTO
CLOCK
8;
8255A-5
DBO
TO
DB7
AO
Al
lOR
lOW
CS
IRT
PBO
8
LS244
TO
/
I
DRIVER
PB7
PAO
PA3
~
PA4
PA7
~
DRIVER
PC7
I
>---
PC2
PC!
t - -
rl
SHIFT
~
PAl
PC2
1
PC4
I
} - -
Figure 2-20 Parallel Printer Control Block Diagram
2-30
DATA
8
TO CONNECTOR
I
L
-
PBO
TO
PB7
{
PE
PRINTER
CABLE
CONNECTOR
PIN NUMBERS
11
13
15
17
19
21
23
25
22
SE LECT
7
FA ULT
14
+5V
18
INPUT PR IME
10
B
ST
USY
3
ROBE
SG
..
5
{
1,9,20
4,12,24
6,16,26
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