Service manual
-
PC- l600
Pi.
Sy
mbol
No
.
63
KAl
54
KA
.
55
KAO
..
CKO
"
IOAP
68
C/~
59
10SiJ
60
•
6.
OMEO
62-70
PAQ
- PA7
6.
VSS
71
P02
72
P66
73
PBS
74
P.
7
75
P
es
I
n/Out
Actille
level
00"
L
~
""0
L
~
"",
L~
"",
"",
L~
"",
H
igh
"",
L~
"",
High
"",
H i~
v
In
/
Out
V ln
v
In
/
Out
v I
nfOut
.,.
"",
F
unction
Goes
low
when
the
Z..aO
I/O
28
H-
2FH
i.
written.
Goes
low
when
the
Z.ao
I/O
28H-2FH
i.
read.
Goes l
ow
when
the Z-80 I
/O
60H-6F
H
II
accessed.
A 217KHz
~S
outpUt.
Th
llslgn.
1
is
supp
lied
to
the
H061
203
(5) LCD driver .
This signal
is
issuad
olliV
when
bit
"b4"
of
the Z-80 I
/O
37H
is
at
"''',
Bit
" b4"
il
.1
"0"
.,
~
,
-on,
but
turns
to
"1"
in
the
power-on
routine
10
activlte
the
LCD.
Goes
low
when
thl
2-80
reed.33
H
of
110.
This
.ignalls
uled
by
the
Z-80
to
,
..
d the return
dete
from
the
LU
578
13P,
Goes
high when the Z-80 wr ites
3D
H
of
I/O.
Dall life
'e
tched
It
• low
10
hi
gh
transition of
c/D.
When
the
signel
ri
ses
wi
th
. helf
clock
delav
from
lORa
, the dIU!
bu,l.
IUlbl
e.
Goes l
ow
when
the
Z-
80
110
20H-27H
is
acee$Sed.
This
sign.
l
ls
uMd
for
Mlect
lo
n
of
the
TC8576F
UART.
Goes high when
lhe
Z·80 I
/O
40H-
5FH
is
accessed.
This Ilgnll
Is
uMd
to
In
tarfle.
with the
6800
Ilerl.1
LSI
Ind
il
connected
to
the
H061
202
LCD driver Input.
This
signalllluultd
with . half clock delay stower than
10RO
.
LH-5803 memory
Mllet
lignal.
Th
is
lignalllOlS
hilJl!
when
the
LH
-5803
acC1S1fII
t ha memory.
Correspondlto
th
l
port
PA of
thl
LH·5810 I/O
port.
Thil lignal
ls
u
ed
for
the
key . trobe signal. To restore the original
state
of
the low-
forced
urobt
lignal,
thll.lgnll
must
be
turned
high
Ind
then set
in
the
input
mode.
The Input
Ilgnllls
pulled
up
internilly.
.w
UMd for the cassette tape
to
reproduce
Illgnal.
Pulled up internally.
Used
for
In
input port
by
the
PC-16CX)'
Input
to
t
hi
l
IIn
lIs
11/
64
Mcond puille which is issued from
th
e LU5
78
1
3P
sub-
controller. Pull
ed
up
Internally.
Used
for
th
e key Itr
Obe
Ilgnal.
Application
i,
the..me
II
for
the
PA7-PAO.
Pulled up i
nt
ernilly.
R
eceivelthe.tate
of thllBREAK/ONlkey
lent
from the subcontroUer.
Pulled down internally.
Used
by
thl
Z-80 for I
beep
generltion.
The following circuit
II
internally composed in
the
LSI.
'82
3
P-----DI'CG
PCG
'
==:
PC7'
s
uo
Whln
either
the PB2, PC6', pcr,
or
SDO
goel low, PC6 beeomel high.
To
dr
ive
the
boUlr,
one
of
Ilgnal, illUes a pulse.
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22-