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ll
and more abo
ut
Sharp PC-1500
at
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1
/0
po
rt
( LH5810)
Pin Signal
In/out
Connection
Functional
description
No. Name
I
PAI
Inf
out
Key
Port A input/output. Key strobe.
?
l
(
(
?
7 PA7
I
n/out
K
ey
Port A input/
output.
Key
strobe.
8
GN
O
In
Power
OV
9
PBO
In/out Option
Port
B input
/ou
tput
IO
OB
I
In
/out
Option
Port
B input
/out
put
11
PB
2 In
C
MTIN
Port B input(output. Cassette tape data inpu
t.
I2
P83
In GND
Domestic/export specific
ation
select pin
(domesti
c)
vcc
(Export)
13
PB4
In
GNO
Us
er area detennination pin
14
PB5
In
µPDl990C Clock input from TP terminal
of
the timer IC
15
P86
In
µPDI990C
Data input from the DATA
Otrr
terminal
of
the
timer
IC
16
PB7
In Key
BR
E
AK
key input (interrupt input)
17
p~
In
GND
PC
port
latch clock input
18
PCO
Out µPD l990C Data ou
tput
to
the DAT A IN terminal to the timer
IC
19
PC
! Out
µPDl990C Strobe
output
to
the
ST
B tenminal
of
the
timer
IC
20
PC2
Out
µP
Ol9
90C Cl
oc
k o
utput
to the LK tenminal
of
the timer
IC
21
PC3
Out µPD1990C Timer IC
con
trol signal
outp
ut
22
PC4
Out µPOI990C Timer IC control
signal
out
pu
t
23
PC
S Out µP01990C
Timer IC control signal
out
pu
t
.
24
PC6
Out B
uzur
25
PC7
26
cso
In
CPU
Chip select input connected
to
ADl2
27 CSI In
CPU
Chip select input conn
ec
ted
to
A013
28
CS2
In
Decoder IC Chip select in
put
connected
to
Y3
of
the chip
'
sele
ct
decoder IC
1 1
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