IBM Aptiva 2142 - Manual (Page 42)

Amplifier Card BIOS
Type 2140, 2142 computers come with either a Tier 1 or Tier 2 amplifier
card.
Tier 1 amplifier card has one speaker output jack
Tier 2 amplifier card has two output jacks; one for the speakers and
one for the sub woofer.
When replacing a system board, the BIOS setting on the new system board
must match the amplifier card that is installed in the computer.
New A-1 and A-2 system boards for Type 2140, 2142 are coded for the Tier
1 amplifier card. If the computer you are servicing has a Tier 1 amplifier
card, no BIOS coding is necessary.
If you order a new system board for a 2140, 2142 that has a Tier 2 amplifier
card, the amplifier card BIOS must be set to match the Tier 2 amplifier card.
Amplifier Card BIOS Setting
Attention
The Amplifier BIOS update procedure must be run from a Safe Mode
Command Prompt.
Care must be taken to make certain that the BIOS setting matches the
actual amplifier card (Tier 1, Tier 2) installed. The sound system will not
function properly with the incorrect setting.
1. Determine the amplifier card installed. From the rear of the computer,
there will either be:
One mini DIN connector (speaker), Tier 1,
-- or --
Two mini DIN connectors (speakers and sub woofer), Tier 2.
2. Determine the system BIOS setting for the amplifier card.
Reboot the computer to a Safe Mode Command Prompt.
a. Select Start from the lower left desktop.
b. Select Restart The Computer, then Select Enter.
c. When Starting Windows 95 displays at top left corner of
screen, depress F8.
d. Select Safe Mode Command Prompt Only from the menu.
e. At the C: prompt, type DEBUG and press the Enter key.
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