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and
more
about Sharp
PC-1500
at
http://www.PC-1500.info
2-3-6. WAIT function
(interfacing with the
slow
access time memory)
lkcausc the
Cl'lj
access
tintc
is vtry
fast. 1hc C
Plj
rnust be
held \\
1
ith
the
\Vait
signa
l
in
order
10
access
a
slo\v
a
ccc~s
tin1c
rncn1ory.
l3ctsically.
thi:
\vait
signal
is
created
by
the
e xte
rnally
pr<>vidcd
Coln'lt<:r.
b ut
the
J
'
0
port
controller
with
the
programmable
wait
time
control
feature
( LH~S
11
)
is
us<d
for
this
purpose. F'
o r
rnorc
details
of
this
function.
refer
10
the
:5CCtion
discus.sing
the
1
1
0
port
corn
roller.
Shown
in
the
next
page
is
the
connection
of
the
CPU
with
the
110
port
controller.
OS
0M£0
-
-
R
/
\'I
CPU
MEO
1/0
1
l(lrt
l),t.1:;1
M(
I
-
c;tJnU<Wl.;r
1:0-0~
\'I
All
WO
VII
MEO
W3 tl
¢
¢r1<.!it i(lf1
1.1e1
wait
corw:ht1
AOO·-
?iOIS
23
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not
sale
this PDF!!!
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