IBM Mother Board 486F39X, User Manual

Page: 21 / 37

Chapter
2:
Hardware
Guide
System Speed Change
The 486F39X mainboard can be configured for turbo or slow
speeds to accomodate most DOS
applications. On power up, the
system will be operating at turbo speed (factory setting).
You can switch between turbo and slow speeds by toggling the
turbo switch or pressing the keyboard keys.
l
Toggling the Turbo Switch
1) Set the turbo switch to the on position to slow down the
system speed.
2) Set the turbo switch to the off position to speed up the
system speed.
l
Pressing the Keyboard
Keys
Note: Before using
the keyboard keys to control the system speed,
the turbo switch h a s to be set to the off position.
1) Press the <:
CTRL > < ALT >
keys while simultaneously
pressing the < - > key to slow down the system speed.
2)
Press the
< CTRL > < ALT >
keys while simultaneously
pressing the < + > key to speed up the system speed.
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486F38X User’s Manual