Service manual
PC-l600
Plo
Symbol I
n/Out
Active
Function
No
, Iellel
PB2:
Clssette
reproducing ' ,gnet
PCS
':
Beep
diSlible
sJ~.
1.
PC7
';
Cassette reeordlng slgn.1 (PC-
1600)
.
Soo
';
Cassette recording sign-' (PC-'
500)
.
,.
SIlO
Qu,
Cassette recording
IIIg!'lll
l OUtput.
SIlO'
I
)
D
SDO
PC7'
500'
is
the
can
e
ne
recordl~
outPUt by
the
CE-l50.
PC7'
is
the
canette
recording outjXIt by
the
CE-'600P.
77
ELH
Qu,
(n
A low s
tate
of
this ,Ignal
Indlcues
that
th
a
LH
·
5803
il in
operation.
(2)
A high
Ilate
of
thi
' signal indicat
el
that
Ihe Z-80 i. in
operalion.
78
PCSTS
In
lOut
In
Goes
into
the
input
mode
when reset. This
current
state
is
latched
in
the PB3 flip·fl
op.
Theref
ore, e
ither
pull
ed
down
or
up
by
an Itxtemal
resinor.
For
the
PC-1600, the
machine
vel'1lon i.
rapr
_nted
by
thb
signal.
PS3
- 0 :
Japan
ver,ion
pa
3 - 1:
Ex
po
rt
version
121
Goes
to
thltoutjXIt line In
the
norma
l modlt.
The
signal goes high
when
me
Z-80 writes lBH
or
I/O
or
the
LH-5803
i,
FOOSH
of
the
MEl
. This l
ignall.
not
uMd in
the
output
mode
with
the
PC
-
I600
.
79
ASTIN
'"
L~
A reset
input
to
the
SC7852. This signal
il
forced l
ow
for
30
millisecOnds by
the
sub
CPU
when
ACL
or
AESET
i,
i
,su
ed
or
at
po_-on
.
00
'AQ
-'"
High
An
intenupt
to
the CPU
(Z.ao,
LH
-58031.
This line
i.
input
as an
interrupt
request from
the
PC-I500
peripheral.
81
INTO
'"
High
An
i
nterrupt
to
the
CPU.
This line
Is
I
nput
as an
interrupt
requast from
the
TB576F.
82
INTI
.
,"
L~
An intltl"rupt
to th
e CPU.
This line
Is
input
as an
interrupt
reQU
est from thlt PC-
l600
peripheral.
Pulled
up
internally.
83
INT4
'"
L
An
interrupt
to th
e CPU.
An
Interrupt
i.
se
nt
to
the
CPU
at
I high
to
l
ow
transition. This line
is
input
at
a
1/64
second
pulse from
the
,
ub
CPU. It i.
ex
ternally
shorted
with PB5.
But,
the
sub
CPU outpUt, which
Is
a P
-c
h
open
dr
ain,
is
pul.led
down
by
the
external
resistor
to
assure a l
OW
output.
..
'N16
-
'"
High
An
interrupt
to th
e C
PU
.
This line
inputs
the
output
f
rom
the
sub
CPU .
8'
PCTAL
Qu,
L~
At
the
time
the
powtr-oH
command
Is sent
to
the
sub
CPU,
th
e
sub
CPU
turns
the
power
off
(active low).
This signll
gotl
low
Itter
the
Z~O
complet
as
the
following:
(I)
11
H
written
10
1/0
37H
HI)
OUT
I38Hl. A
(til)
HALT
..
eLK
Qu,
Z-80 cl
oc
k outpUt .
3
.58
MH:r
for
th
, PC-1600.
87
T
-"
(1)
It
i.
in
th
e normal
mode
when
e
low
1Ig!'llli
is received
and
the
Z-ao
is
operating
normally. Pulled
down
intltl"nlily.
(2)
It il in
me
s
imulltion
mode
when
I hi
gh
sign
ll
is feceived.
The
Z-80 bus
is
in
the
floating
stete,
I nd
th
e Z-
SO
(or
Z-BO
ICE I
can
be
con
n
ected
IXnrnally.
88
XOUT
"",
The
3.58MHz Z-80 clock i' lUPPlied
when
th
e oscillator is
ettached
ec
ross these lines.
89
X'N
'"
90
VDD
Power
Input
to
the
high side
(4-5
.5VI.
-
23
-