Sharp MZ-5500 User Manual

-
MZ-5600
8-9-3. Internal block diagram
RAW DATA
IRS
81NCH I
MFM
M2R
M2C
CSPI
lORD
Ta.\R
RES
lAD
IAI
100
ID7
IR-PRT
I
Delay
circuit
Phase
PDL PDH PUL PUH
Cex 1
Gain change circuit
Cex 2
~
--
S-R
r-----
pulse
..
circuit
I-
Loop
f-
change
circuit
compare
circuit
Voltage
control
oscillator
I
I
I
I
T
t
r---I-----T--------
1
I .. .. ,....a..-_.....,. ....-----,
}-_+I-I GAP SYNC ID ...
I
I
I reset -- count ---- separator r------
}---:--I circuit circuit circuit
I
I
VFO
SYNC
circuit
~
I
I
L _S:'N~ d~e~ ~o~ _ _ _ _ _
______ .1
Q.NR
I
Divider
~
circuit
TPI
4 ~~M
I
WIND
Decoder
RD DATA
I
I
L..- _____________ -{
--{
--0--
il-
I
GND
M5C
M5R
9. PRINTER INTERFACE
825PA
cs
pe5
(>0-----0 S1IDBE
Rii
WR
PAD
DATAl-fi\TA8
RESET
PA7
AO
AI
PCS
PHD
1-----0<, 1--Nl~-oBUSY
PHI
1----oc::uf-Nl----oPE
PCS
PH2
1----oc~f-Nl----OSELEcr
L- ________ ~ Do----oSRES
Fig. 48
-44-
9-' Logic description
The printer interface uses an integral parallel interface
controller, 8255. The 8255 has the modes shown in the
table
at the right. Group A of the 8255 is used in Mode 1
for Centronics interface, so that the CPU may be inter-
rupted by an ACK signal from the printer by Mode 1
function.
Table 24
Mode 1
PAO
output
-
PA7
PC7
PC6 ACK
PC5
OUT
PC4
OUT
PC3 INT
Mode 0
PC2
output PC1 OUT
PCO
Mode 0 PBO
input
-
IN
PB7

Sharp MZ-5500 Specifications

General

Brand	Sharp
Model	MZ-5500
Category	Desktop
Language	English