Service manual

PC-l600
Pin
Symbol
InlOut
Actille Stfte
Function
No .
level
el ACL
:l8
KC3
'"
Not u58d.
J9
KC2
"
Used for ch ec king the CE ·1600P ~r supply lewl . VPP suppll&l;l from
the CE ·l 600P vie the ryltem bus Is AID COfl'llerted. If it is below the given
level, the peripheral is assumed to hlYl II weak battery co ndition.
40
KC'
"
Used f Ol" checking the PC · l600 main POWIt!" supply level . The l ewl of the
main power supply is AID converted and checked. If It is below the lIiven
level, a weak battery condition Is assumed.
..
KCO
"
Recll1v H the lillnal input from the analO1l input connectOl".
"'
For the a na l og input, AID COfl'll efJl on is dont! .
'"
For the axternal keyboard input, ill logic level Is in1e.-regated.
42 A33
,,",
"
MSB
4J
A32
""
'"
.. A31
"" "
45
A30
,,",
"
Return da te to the Z-80.
...
A23
,,",
'"
47 A22
,,",
" ...
A"
,,",
'"
49 A20
,,",
"
LSa
"
VAL
NC
"
S'N
"
NC
"
VOO
High power supplV vo ltege l lMll IVGG).
53 A13
"
"
Msa
54
A"
"
'"
56
An
" "
56
A"
" "
Commend from tha Z-80.
"
AOJ
"
'"
58 A02
"
"
59
AO'
"
"
60
AOO
"
"
Lsa
"
03
"
Low
"
Hardwera sensed week banery detection slgnel.
A hillh
on this line causes the CPU to force the syltem to 110 dow n. The only
means
to turn the system on efter rlllCOYlfy of power supply is the depression
of the BREAKI ON key or ALL RESET switch. The time in the .... I·time
timer would not be rwised.
• 2
Q2
"
"
Not used. Pulled down .
63
01
"
Low
'"
Opposite polarity as CI of the A5-232C intmec •. It i. possible with CI to
ru rn on the system wh.n thesvuem i. off (when thl.lin . is at .Iow lwei).
64
ao
"
L~
"
If this sillnal I. at a low level when the svltem-off commend i$ rectived from
the Z-80, th. system is wrned off .
- "' -