Some early IBM computers require you to press and hold both mouse buttons as the computer boots to enter the BIOS setup. See the computer manufacturers list for contact information. Because these diskettes are unique to your computer manufacturer, you must obtain the diskettes from them.
These diskettes may be referred to as ICU, BBU, or SCU disks. BIOS or CMOS diskettesĮarly 486, 386, and 286 computers required a floppy disk to enter the BIOS setup. Older AMI BIOS could be restored to bootable settings by pressing and holding the Insert key as the computer is booting. While continuing to hold the F10, two beeps should be heard indicating that the settings are restored. If your Acer computer cannot boot or you want to restore the BIOS to its original settings, press and hold the F10 as you turn on the computer. Below is a listing of key sequences to press as the computer is booting to enter the BIOS setup. Unlike the computers of today, older computers (before 1995) had numerous methods of entering the BIOS setup. If F10 doesn't work, look at the bottom or top of the screen for the key that's used to save the settings. If any changes are made, you need to save those changes, which is usually done by pressing the F10 key on the keyboard.
For help with replacing the battery, see: How to replace the CMOS battery. If changes you made appear to revert to default settings or the date and time setting in the BIOS keeps falling behind, you may need to replace the CMOS battery.
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