Epson PX-8 - Jumper and Switch Setting

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.
2-57