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M
7.
3500
7-1. Printer interfacing circuit
7.
PRINTER INTERFACE
AS 4 • AS 5 AS6 • AS 7
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I
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Al
Z80 AO
SUB
CPU
AR
Chip
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'arallel
interfacing
signals
"N S1W
^
,
DSO
_
DS1
^
DS2
DS3
DS4
^
DS5
v
DS6
^
DS7
CS
8255
PA
RD
PA
PA
WR
PA
Al
PA
A
° PA
PA
PA
PC
PC
PC
PC
PC
PC
1
L_
~
0<
xr
LS244
0
1
2
3
4
5
6
7
5
6
7
0
1
2
H/ ©
DA1A2
H^ ©
"
A
^
A
3
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(3)
DAT
16
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(g)
DATA?
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D \TA S
rv_
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v
*~i
1 "No
ffi\ STRDRF
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ACK
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PDTR
*
2,4,6,...
28areGND.
*
Ahnwp
nin
numbers
are of the
model-3
Pin
No.
1
3
5
7
9
11
13
15
17
19
21
23
25
27
Signal
name
STROB
DATA
1
DATA
2
DATA
3
DATA
4
DATA
5
DATA
6
DATA
7
DATA
8
ACK
BUSY
PE
PDTR
SYSRES
IN/OUT
-
PRINTER
-PRINTER
-
PRINTER
•
PRINTER
-
PRINTER
-
PRINTER
-
PRINTER
Function
Data
is
transfered
to
printer when STROB
is
high.
Data
output
to the
printer
Indicates
the end of
character
input
or
function
input
i
When
high,
it
enables
to
receive
data
When
high,
it
indicates
paper
empty
When
high,
it
indicates
the
SELECT
mode
(receive
enabled!.
Reset
signal,
normally
high
-
78
-