Printer interface, 1. printer interfacing circuit, 2. parallel interfacing signals – Sharp MZ-3500 User Manual
Page 71: Vsaa, O <i, Z80 sub cpu lokq, Data i dat a2 data3 data 4, Data5, Data6 _(0) uata7 data8, Strobe ack dso dsl
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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
I o d e 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