Sharp MZ-700 manual MZ--700

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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 -D7		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.
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INT		Interrupt input	In		Data transfer strobe MZ· 700 -+MZlPOl.
RD		Read signal	In		Not used.
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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, X2		Crystal inputs	In		generate internal clock. However, external clock signal may be
					inpu tted through these pins.

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