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)
=============================================================================
Switch
Position
Status
Function
-----------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------
Switch
Position
Status
Function
-----------------------------------------------------------------------------
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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