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PC-1600
Pin
Symbol
ln/Out
Active State
Function
No. level
at ACL
38
KC3 In
Not used.
39
KC2
In
Used for checking the CE-1600P power supply level. VPP supplied from
the CE·1600P via the system bus is A/O converted. If it is below the given
level, the peripheral is assumedto have a weak battery condition.
40 KCl
In
Used for checking the PC·1600 main power supply level. The level of the
main power supply is A/O converted and checked. If it is below the given
level, a weak battery condition is assumed.
41
KCO
In
Receivesthe signal input from the analog input connector.
(1)
For the analog input, A/O conversion is done.
(2)
For the external keyboard input, its logic level is interrogated.
42
R33
Out
In MSB
43
R32
Out
In
44
R31 Out
In
45
R30 Out
In
Return data to the Z-80.
46
R23 Out
In
47
R22
Out
In
48
R21 Out
In
49
R20 Out
In
LSB
50
VRL NC
51
SIN In NC
52
VOO High power supply voltage level (VGG).
53
R13 In In
MSB
54 R12 In In
55
Rll
In
In
56
Rl0 In
In
Command from the Z-80.
57
R03 In In
58
R02 In In
59
ROl
In
In
60
ROO In In LSB
61
Q3
In Low
In
Hardware sensed weak battery detection signal.
A high on this line causesthe CPU to force the system to go down. The only
means to turn the svstern on after recovery of power supply is the depression
of the BREAK/ON key or ALL RESET switch. The time in the real-time
timer would not be revised.
62
Q2
In
In Not used. Pulled down.
63
Ql
In Low
In Opposite polarity asCI of the R5-232C interface. It is possible with CI to
turn on the system when the system is off (when this line is at a low level).
64
QO
In Low
In 1fthis signal is at a low level when the system-off command is received from
the Z-80, the system is turned off.
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