Compaq 386 manual System Board assy. no Switch Settings

Maintenance and Service Guide 8-3

Table 8-1. System Board (assy. no. 000401) Switch Settings

Switch	Switch
Position Number	Positions	Function
1	ON	Reserved
2	ON	Coprocessor installed
	OFF	Coprocessor not installed (default)
3	ON	Coprocessor speed 4 MHz
	OFF	Coprocessor speed 8 MHz (default)
4	ON	CPU boot speed 16 MHz except when
		accessing diskette drive; then 8 MHz
		(default)
	OFF	CPU boot speed 16 MHz always
5	OFF	Reserved
6	ON	COMPAQ VDU, COMPAQ ECG, compatible EGA,
		RGBI, or VGC (default)
	OFF	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)