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Hardware Overview
025-9416
19
JP9
JP10
JP6
a
b
JP12
JP3
JP1
JP2
JP8
JP14
JP7
JP4
JP13
JP5
JP11
a b
a
b
a
b
a
b
Front of
Model 640
Chassis
⇒
Figure 4. Main Board Jumper Locations (Top View)
The jumpers are used as noted in Table 2.
CAUTION
Jumpers 1-9 and 11 on the main processor motherboard (Part No. 702-9673) should not
be changed. These jumpers are factory set, based on the custom system ordered. This
information is provided for reference only.
Table 2.
Table 2. Main Board Jumper Settings
Jumper
Function
Settings
Default
JP1
Sets ROM memory size
IN
OUT
IN
JP2
Identifies ROM memory size
IN
OUT
IN
JP3
Provides reset to the keyboard interface port
IN - reset
OUT
OUT
JP4
ISA interrupts expansion
IN
OUT
OUT
JP5
Disables watchdog timeout during initialization
A
B - disabled
A
JP6
RESERVED
A
B
B
JP7
Disables RAM parity error interrupt
IN - disabled
OUT
OUT
JP8
Sets non-volatile RAM size
A
B
A
JP9
Enables RAM disk reformat (in conjunction with JP10)
IN - reformat
OUT
OUT
Содержание 640 DAPT XTRA
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Страница 198: ...Parts Lists and Schematics 186 025 9416 RAM Disk 702 9386B ROM Disk 702 9389B...
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Страница 200: ...Parts Lists and Schematics 188 025 9416 Terminal Block Adapter 702 9470B...
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