Sharp MZ-3500 Instrukcja Użytkownika Strona 71

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M 7. 3500
7. PRINTER INTERFACE
7-1. Printer interfacing circuit
Kl)
Z80
SUB
CPU
lOKQ
WR
A1
AO
AS 4 - ASS AS6 ■ AS7
AR Chip S03
Ch 1 p
ScU’i t
Iode r
CS 8255
KU
WR
A1
AO
PAO
PAl
PA2
PA3
PA4
PA5
PA6
PA7
PCS
PC6
PC 7
PCO
PCI
PC2
<o
<i>
DATA I
DAT A2
DATA3
DATA 4
-(d) DATA5
4^
DATA6
_(0) UATA7
DATA8
----
@
STROBE
ACK
DSO
DSl
s.
US 2
DS3
DS4
DS5
s.
DS6
DS7
7-2. Parallel interfacing signals
LS244
<<1-
-VSAA-
Busy
-® PE
PDTR
2, 4, 6,... 28 are GND.
Above pin numbers are of the model-3500 main unit.
Pin No. Signal name
IN/OUT
Function
1 STROB
- PRINTER
Data is transfered to printer when STROB is high.
3
DATA 1
PRINTER
Data output to the printer
5 DATA 2
7 DATA 3
9
DATA 4
11
DATA 5
13
DATA 6
15
DATA 7
17 DATA 8
19
ACK
- PRINTER
Indicates the end of character input or function input i
21
BUSY
* PRINTER
When high, it enables to receive data
23
PE
- PRINTER
When high, it indicates paper empty
25
PDTR .
- PRINTER
When high, it indicates the SELECT mode (receive enabled).
27
SYSRES
- PRINTER
Reset signal, normally high
78
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