Jumper And Switch Setting - Epson PX-8 Technical Manual

REV.-A
2.5 Jumper and Switch Setting
All the jumpers and switches including a DIP switch mounted on the MAPLE board are listed in
Table 2-10 together with their summarized functions.
Table 2-10 Jumper And Switch Settings
Standard
Circuit
Name
Setting
Drawing Associated Signal/Function
Coordination
J1 T/N A-2 HLTA: Open - Specifies Toshiba unit.
Closed - Specifies NEC unit.
J2
OFF A-6 OVERCHARGE: Open - Controls overcharge
protection.
J3 OFF C-7 TEST: Closed - Operates sub-CPU 7508 in
test mode.
J4 ON 0-7 Analog Input pull-up:
Closed - pulls up ANIN input line to VB through
a 100 kohm resistor.
J5 **A/B E-6/7 LP pulse hold:
A - Holds 8 LP pulses.
B - Provides no LP pulse holding.
SW1 OFF C-7 Power switch
SW2
*N/O
C-7 Reset switch (main frame system rest)
SW3 ON A-7 Auxiliary battery switch:
ON - Enables backup from auxiliary battery.
1
-
Used to keyboard models.
2
-
3
-
S
4
-
W C-7
5
-
4
6
-
7
-
8
-
S
A
W
*N/O A-4/5 Ensures initialization during backed-up operation.
5
B *N/O 0-6 Initial reset: Sub-CPU 7508 reset
Notes:
* A push switch containing two sets of contacts.
* * A or B is selected depending on the used LCD.
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