Printer Interface - Sharp MZ-5500 Tehnical Manual

9.
Printer interface
*Common for the MZ-5500 and MZ-5600.
9-1. Circuit description
Tl\e 8255A is used for the parallel interface controller wh1ch is operated
under the following mode setup. For the Centronics interface, Group A of
tlle 8255A is operated under the mode-l and the ACK signal from the printer
applies the interrupt
(CPU side)
ID~
~
Hn
1 R-
fRT
~--4--- 1
825SA mode
to the CPU.
82ssA
e5
RD
~
RESfT
Atj
AI
pes-
PAS
~
pA?
PC6
PBS
FC3
PB,
PB2
°IOCS
~
(Printer side)
STRöBE
DATA ,
IV
DATA 8
ACK
BUS),
I1
PE
SElECT
~-----~
SRES
11
V
11
mark: lKohms pulhip resistor
control procedure
hiODEl
outr~t
I ­
PAO
I
PA1
PC1
PC6
PCS
PC.
PCS
ALK
OUT
om
INT
hiODEO
outpvt
PC2
pet
üm
f-----.
PCO
hiODEO
PBO
li1~ut
I
IN
'--­
PB1
*Centronics interface
Printer interface method which 16 popular worldwide.