Compaq Portable 486 Compaq Portable 486c Personal Computer Maintenance and Ser - Page 87

Jumper and Switch Information

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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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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.
-----------------------------------------------------------------------------