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Maintenance and Service Guide 8-3
Table 8-1. System Board (assy. no. 000401) Switch Settings
Switch
Position Number
Switch
Positions
Function
1 ON Reserved
2 ON
OFF
Coprocessor installed
Coprocessor not installed (default)
3 ON
OFF
Coprocessor speed 4 MHz
Coprocessor speed 8 MHz (default)
4 ON
OFF
CPU boot speed 16 MHz except when
accessing diskette drive; then 8 MHz
(default)
CPU boot speed 16 MHz always
5 OFF Reserved
6 ON
OFF
COMPAQ VDU, COMPAQ ECG, compatible EGA,
RGBI, or VGC (default)
Third-party monochrome
Table 8-2. Locations for the Processor, Coprocessor, and System ROM on the
System Board (assy. no. 000401)
Location Description
U11 EVEN System ROM
U13 ODD System ROM
U39 Coprocessor (80287-3, -6, or -8)
U56 Processor (80386-16)