Printer Interface - Sharp MZ-3500 Service Manual

M 7. 3500
7-1. Printer interfacing circuit
7. PRINTER INTERFACE
AS 4 • AS 5 AS6 • AS 7
R I )
I ORQ
Al
Z80 AO
SUB
CPU
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rs. -^jp
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'arallel interfacing signals
"N S1W
^
, DSO
_ DS1
^ DS2
DS3
DS4
^ DS5
v
DS6
^ DS7
CS 8255
PA
RD
P A
PA
WR
PA
A l
PA
A
° PA
PA
PA
PC
PC
PC
PC
PC
PC
1
L_
~
0<
xr
L S 2 4 4
0
1
2
3
4
5
6
7
5
6
7
0
1
2
H/ ©
D A 1 A 2
H^ © "
A
^
A
3
C|^» (3) DAT 16
ts^ i^^ —
CP^» (g) DATA?
ol ^^ Op) D \TA S
rv_ rs_
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v
*~i 1 "No ffi\ STRDRF
^o^l-X}—^^^
ACK
o^l n EU-
I
^J .^ ®
/// ©) 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
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