Specifications

Table 8-2. COMPAQ Portable and COMPAQ PLUS Video Display Controller Board
Jumper Settings
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Jumper
Location Function Pin to Pin 2 Pin 2 to Pin 3
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J3, J5 Enables/disables RGB Disables RGB and RGB and composite
and composite video composite video video output always
outputs in high output when in high enabled (default
resolution scan (default setting for
settings for COMPAQ COMPAQ DESKPRO 286)
Portable, COMPAQ
PLUS and COMPAQ
PORTABLE 286)
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NOTE: Jumpers J3 and J5 must both be changed at the same time or the video
display controller board will malfunction.
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Chapter 8.3 Compaq Portable 286 Fixed Disk Drive Controller Board Jumper Settings
The COMPAQ PORTABLE 286 fixed disk drive controller board jumpers are set at
the factory and should not be changed.
W1 is the fixed disk drive base address select. It is always set on pin 1 to
pin 2.
W2 is the fixed disk drive LED operation. It is always set on pin 1 to pin 2.
For the locations of the COMPAQ PORTABLE 286 fixed disk drive controller board
jumpers, see Figure 8.3-1.