Basic HTML Version
DEDICATED SWITCHES
-------,
, CPU Board
I
I
J205
I
I -
-C~i~ ~r Int~rfa~e
B~.:d- -:
Coin Acceptor
I
,
or
I
J1
J3
,Control Switches
'1
I
Orange-Brown
(U17-5) 01
I r-
r- , ~
I
I
4
r--;--<'
V-
I
I
,
I
Orange-Red
(U17-7) D2
I
~3
5
,
2
,
I
I
,
I
Orange-Black
(U17-11)03
I
6~~
3
2
I
I
,
: Orange-Yellow
(U17-9)
I
,
4
04
I
,
7
I
I
,
I
I
,
I
Orange-Green
(U16-9) 05
I
7h-o'
6
I
1
I
I
,
7
I
Orange-Blue
(U16-11)06
I
ho
8 '
-~
--.--<>
I
I
,
I
Orange-Violel
(U16-7) 07
I
,
8
I
9
9 -'---0 ....
I
I
,
I
I
,
9
I
Oranae-Grav
(16-5)
DB
I
8
1--;.-0 ....
I
I
,
I
I
,
I
Black
I
~5
3
,
__c-
c.2
,
1'-
,_
,
- -
- - - -
- - - -
- - -
-
-
.
PEDICATED SWITCH CIRCUIT
r - - - - - - - - - - - - - - - - - - - - - - - - - -
--I
, CPU Board
+5V
+12V
,
1.2K
J205 ,
A
lN4148
X
lK
74LS240
1
470pf
.
Dedicated Input
, Black
Coin Door
Interface
Board
Coin Acceptor Switches
01
Left Coin Chute
02
Center Coin Chute
03
Right Coin Chute
04
Forth Coin Chute
Control Switches
05
Normal Function: Service Credits
Test Function: Escape
D6 Normal Function: Volume Down
Test Function: Down
07
Normal Function: Volume Up
Test Function: Up
08
Normal Function: Begin Test
Test Function: Enter
, J1
I
I
Coin Acceptor
J3
I
or
I
Control Switch
!-:--===~-:--l X
1-_--1
X
I
~~~----~15
3~-----------
Switch
H
L
A
B C
H L Off
L
H On
Open
Closed
The dedicated switches operate similar to switches in the matrix except that instead of a column circuit there is a direct tie to
ground. Therefore, the column side is constantly active (low).
When a switch closes the row side (dedicated input) of the circuit activates. The
"+"
input to the LM339 drops below +5V
causing its output to go low. Since the row circuit (dedicated input) is tied directly to ground through the switch, the switch is
considered closed by the microprocessor. When the switch opens, the
"+"
input to the LM339 is above +5V, its output is high
and the row is inactive.
Twilight Zone 3-3