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HEV.A
Data Output Circuit
PRINCIPLES OF OPERATION
Direetion of data is only from CPlJ to Printer beeause the DIR of ALS245 is
fixed at low level.
GAATSP
ALS 245
SD7
SD7
OD7
B
A
DATA7
r
)
)
CI
)
~
M-
n
=r
SDO
SDO
CLK
ODO
DATAO
DIR
FIGURE 2-4-3.
DATA OUTPUT (PRINTER DATA REGISTER WRITE)
Output Data Read Circuit
The output data for printer ean be read via LS244 loeated in the GMTSP.
I
0
0
1
007
S07
\
OLO
~
OS
8
r-
. -
o~~
f-
~
r-
...........
I--
f-
........
soo
f -
~:
f-
~
000
-
~
OE
r " _
f -
y
Af-
~
Y L Af--
- y
S Ar--
- y
2
Af--
- y 4
Af---
=~4~~
- y
A
I
~L
I
~oo:
J
GAATSP
FIGURE 2-4-4.
OU1PUT DATA READ CIRCUIT
Printer Control Signal Output Circuit
GAAT5P
bil"
507
507
OIRE
)
~
.--
0511
5LCT IN
'"
<+
OINI
INIT
n
:r
OATF
AUTO FO Xl
500
500
05T8
5TR08E
FIGURE 2-4-5.
PRINTER CONTROL SIGNAL OU1PUT CIRCUIT
2-67
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