-
PC-l600
Pin
Symbol
ln/Out
Active
Function
No.
level
24
CKOS
In
The 00
signal indicates
that the CPU (LH5803)
read timing is at a low level when not
writing, So, it may possibly
be at a low level when not reading,
and it also may not
match
the Z-80's timing during data input/output
of the SC7852
internal
data.
I
To prevent
these problerns,
the signal goes low only when the LH;5803
is reading the
memory
or 1/0 is created
with five signal (MEO, ME1, 00,
CKOS, and BR05).
25
VCC
-
Power supply
(Input of VGG of the system),
26
GNO
-
Power supply.
27
BRQ
In
See Pin No. 24.
28-30
00-02
ln/Out
Z-80 data bus.
31-35
03-07
Out
When the sub CPU outpur
P1 (SLCB), wh ich is sent out when the system is off, is at
a high level, 02-
00 become
low, thus fixing the level of the .input sinal during
system-off
as 02 - 00 are inputs also.
36
c/5
In
High
The
c(B
line 01 the SC7852
goes high when the Z-80 wirites 30H
of the 1/0.
37
10RP
In
Low
The signal used to send R33-
R20 on the Z-80 data bus.
It goes low when the Z-80 reads 33H 01 the 1/0.
38
CL
In
Low
System
reset input.
When this signal is at a low level, it forces A 16A to high, A 15A
to low, and A14A to high.
39
A13
In
CPU address
A 13.
40
A14
In
Input of the CPU address
A14 (insigni1icant).
41
OSR
Out
Not used.
42
CLKl
Out
When the system
is on, CL2 is issued on this line and becomes
the basic clock for the
UART. A low is on this line when the system
is off.
43
KH
Out
High
Opposite
polaritv
of the BREAK/ON
key Input is sent to the sub CPU.
44
A13A
Out
Opposite
polarity
of the A 13 input is sent.
45-47
A14A-A16A
Out
C/O latched
02-00
outpur.
!
Also, A 16A is used for separating
the
CS24
selected
16KB memory
space 4000H-
7FFFH
(bank 3) into two banks.
48-50
LHS1-LHS3
In
Low
Memory
select and 1/0 select signals from the SC7852
are sent to slots of S1: and
!
51-53
KAO-K2
In
Low
S2: via the gate arrav. The reason why is that it has to be set at a high level at
system-off
as the SC7852
power supply
is shut off when the system
is off.
(1 )
When the system is on but not in a weak battery
condition
the status of each
signal appears
on S1, S2, S3, KO, K1, and K2.
(2)
All are high when the system
is off or a weak battery
is detected.
54-56
Sl-S3
Out
Low
LHS1-KA2
outputs,
59-61
KO-K2
Out
Low
All are high outputs
when the system
is off.
62
ME1
In
63
MEO
In
See pin NO.24.
64
00
In
-------
--------
-!-\1-
Summary of Contents for PC-1600
Page 42: ... 11 CIRCUIT DIAGRAM PARTS POSITION KEY P W B LCD SIDE 39 ...
Page 43: ...PC l600 40 ...
Page 44: ...PC 1000 KEY P W B LSI SIDE 41 ...
Page 45: ... 42 ...
Page 48: ... PC l600 F P C P W B 45 ...
Page 49: ... Kn 46 ...
Page 52: ... PC l600 CONNECTOR P W B 49 ...
Page 53: ... 50 ...
Page 55: ... __ PC l600 tli I ONLY Pc 1600K I I 1 I 52 l J ...
Page 56: ... PC l600 K MEMORY P W B ROM Cut c IJ O lJ1F C O lJ1F I Bend capacitor to inward ROM SIDE 53 ...
Page 57: ...RAM SIDE 54 ...
Page 61: ...I I 2 3 4 42 58 ...
Page 93: ... P W B LSI SIDE t 90 ...
Page 117: ... PC I600 ...