Chapter 6. Jumper and Switch Information
This chapter provides the switch settings for the COMPAQ PORTABLE 486c
Personal Computer I/O board. The I/O board contains six switches. The
default settings shown in the following table are set for the computer as
configured by Compaq Computer Corporation. These settings need to be changed
only when the system configuration changes.
Table 6-1 lists the switch settings and describes the function of each
switch. Figure 6-1 shows the location of the switches on the I/O board.
Table 6-1. I/O Board Switch Settings (Assy No. 002142)
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Switch Position Status Function
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SW1 ON Disabled Controls the integrated
OFF Enabled video graphics controller.
OFF is the default position.
ON is used to avoid conflict
when using a third party
video board.
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SW2 ON Enabled Controls EISA configuration.
OFF Disabled
OFF is the default position
and allows the user to change
the configuration in CMOS.
ON allows the EISA
configuration to be viewed
but not changed.
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SW3 ON Enabled Controls Read/Write
OFF Disabled to the Diskette Drive.
OFF is the default position
and allows Read/Write
capability.
ON sets the diskette drive
for Read only.
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Switch Position Status Function
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SW4 ON Enabled Controls whether the diskette
OFF Disabled can be used to restart.
OFF is the default position
and uses the EISA
configuration selection.
ON allows the user to restart
from the diskette drive and
overrides the EISA
configuration selection.
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