Sharp PC-1500 - PC-1500 Circuit Descriptions and Schematics; PC-1500 Chip Select Circuit Operation

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Read/write timings for 1/0 port
Yl'Al1' * __ _
D0 -7 -----<====>-
(a) Data read from 1/0 port
MREQ'i:
_ _,
R1w-----.
~---~
WAIT *-- ~
vo-1 -- c=======> -
(b) Data wire to 1/0 port
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NOTE:
Clock q, is furnished to the
¢OS input of the I/O port.
MREQ• is an inversion of
MREQ of Z-80 and furnished
to the MEO of the I/O port.
WAIT• is an inversion of
WAIT of the I/0 port and
furnished to the WAIT input
of Z-80.
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