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Sharp MZ-800 Service Manual

Sharp MZ-800
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MZ-800
3-6.
Colour plotter printer control
LSI
Pin
assignment
Symbol
Name
In/out
Function
Vss
Ground
Connected
to
OY.
Vcc
Main power
Connected
to
5Y.
Voo
Power
Connected
to
5Y.
PROG
Program
I
Out
Not used.
Plo
~P17
Port I
Used
as
printer control signals.
P2
0
~
P27
I
Port 2
Used for data
input
port from CPU.
Do
-
D7
1
Data bus
Used for stepper
motor
control signals.
I
To
Test pin 0
In
Input
from pen change switch.
Tl
1
Test pin 1
In
I
Input
from paper feed switch.
INT
i
Interrupt
input
In
Data transfer strobe
MZ-
700 ...
MZ
1
PO
1.
I
RD
I
i
Read signal
In
Not
used.
-
I
Write signal
I
Out
Not used.
WR
i
I
RESET
!
Reset
In
Used
to
initialize the processor.
ALE
1
Address latch enable
Out
I
Not used.
I
I
I
PSEN
I
Program store enable
Out
I
Not used.
SS
I
Single step
In Not used.
EA
External access
In Active when EA
=
OY.
Pins used
to
attach the crystal oscillatQr or
RC
network
to
Xl,
Xl
Crystal inputs
In
generate internal clock. However, external clock signal may be
inputted
through these pins.
40

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Sharp MZ-800 Specifications

General IconGeneral
BrandSharp
ModelMZ-800
CategoryDesktop
LanguageEnglish

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