Colour Plotter Printer Control List; Pin Assignment - Sharp MZ-700 Service Manual

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MZ--700
[COLOUR PLOTTER PRINTER CONTROL LSI]
Pin assignment
Symbol
Name
In/out Function
Vss Ground
Connected to QV.
Vcc Main power Connected to SV.
VDD Power
Connected to SV.
PROG Program
Out Not used.
Plo - PI
7
Port I Used as printer control signals.
P20 - P27
Port 2
Used for data input port from CPU.
Do -D
7
Data bus
Used for stepper motor control signals.
To
Test pin Q In Input from pen change switch.
Tl
Test pin I In Input from paper feed switch.
.
INT Interrupt input In Data transfer strobe MZ· 700
-+
MZlPOl.
RD
Read signal In Not used.
"
WR Write signal Out Not used.
RESET
Reset In Used to initialize the processor.
ALE
Address latch enable Out Not used.
PSEN Program store enable Out Not used.
SS Single step
In Not used.
EA External access
In Active when EA = QV.
Pins used to attach the crystal oscillator or RC network to
Xl, X
2
Crystal inputs In generate internal clock. However, external clock signal may be
inpu tted through these pins.
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