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To Restore BIOS Settings to Factory Default (TF-486 Motherboard)

If the motherboard battery should fail, the BIOS settings which are stored in CMOS memory will have to be reset to insure proper operation. (BIOS is acronym for Basic In/Out Settings, and CMOS is acronym for Complementary Metal Oxide Semiconductor memory)

TF-486 Splash

TF-486 Motherboard Splash

If you are familiar with BIOS setting, the instructions are as follows:

  1. Power up or reboot the CNC, then press Del key to enter CMOS menu.
  2. Select LOAD SETUP DEFAULTS, then press Enter to apply.
  3. Select BIOS FEATURES SETUP, and set the following:
    • Quick Power On Self Test: Enabled
    • Boot Sequence: C, A, SCSI
    • Boot Up Floppy Seek: Disabled
    • Boot Up Numlock Status: Off
    • Gate A20 Status: Fast
    • Typematic delay (Msec): 1000
  4. Select CHIPSET FEATURES SETUP, and set the following:
    • ISA I/O Recovery: Enabled
    • Fast-Back-to-Back: Enabled
  5. Select POWER MANAGEMENT SETUP, and set the following:
    • Power Management: Disabled
    • Video OFF Method: V/H SYNC+Blank
    • Doze Mode: Disable
    • Standby Mode: Disable
    • Suspend Mode: Disable
  6. Select PCI CONFIGURATION SETUP, and set the following:
    • CPU to PCI Write Buffer: Enabled
    • CPU to PCI Byte Merge: Enabled
    • PCI to DRAM Buffer: Enabled
  7. Select INTEGRATED PERIPHERALS, and set the following:
    • IDE HDD Block Mode: Disabled
  8. Save and exit CMOS

If you NOT are familiar with BIOS setting, screen shots and explanations follow:

TF-486 motherboard BIOS screens: Restore settings to factory default:

TF-486 Motherboard BIOS Main Screen: Load Setup Defaults
BIOS Main Screen:
Power up or reboot the CNC, then press Del key to enter CMOS menu.

Use arrow keys to highlight "LOAD SETUP DEFAULTS", then press Enter, then press "Y", then press Enter again.
TF-486 Motherboard BIOS Main Screen: BIOS Features
BIOS Main Screen:
Use down arrow to highlight "BIOS FEATURES SETUP", then press Enter. BIOS FEATURES SETUP screen should appear.
TF-486 Motherboard BIOS Features Menu
BIOS FEATURES SETUP:
Use arrow keys to highlight each of the following six items, and use the "+" or "-" keys (or Page Up or Page Down keys) to change each value to match the list. Then press Esc key to return to Main Menu.
  • Quick Power On Self Test: Enabled
  • Boot Sequence: C, A, SCSI
  • Boot Up Floppy Seek: Disabled
  • Boot Up Numlock Status: Off
  • Gate A20 Option: Fast
  • Typematic Delay: 1000
TF-486 Motherboard BIOS Main Screen: CHIPSET FEATURES
BIOS Main Screen:
Use arrow keys to highlight "CHIPSET FEATURES", then press Enter. Chipset Features Screen should appear.
TF-486 Motherboard CHIPSET FEATURES Settings
CHIPSET FEATURES SETUP:
Use arrow keys to highlight the following two items, and use the "+" or "-" keys (or Page Up or Page Down keys) to change each value to match the list. Then press Esc key to return to Main Menu.
  • ISA I/O Recovery: Enabled
  • Fast-Back-to-Back: Enabled
TF-486 Motherboard BIOS Main Screen: POWER MANAGEMENT SETUP
BIOS Main Screen: Use arrow keys to highlight "POWER MANAGEMENT SETUP", then press Enter. Power Management Screen should appear.
TF-486 Motherboard BIOS: Power Management Screen
POWER MANAGEMENT SETUP:
Use arrow keys to highlight the following five items, and use the "+" or "-" keys (or Page Up or Page Down keys) to change each value to match the list. Then press Esc key to return to Main Menu.
  • Power Management: Disable
  • Video Off Method: VH SYNC+Blank
  • Doze Mode: Disable
  • Standby Mode: Disable
  • Suspend Mode: Disable
TF-486 Motherboard BIOS: PCI Configuration Select
BIOS Main Screen: Use arrow keys to highlight "PCI CONFIGURATION SETUP", then press Enter. PCI Configuration Screen should appear.
TF-486 Motherboard BIOS: PCI Configuration Screen
PCI CONFIGURATION SETUP:
Use arrow keys to highlight the following three items, and use the "+" or "-" keys (or Page Up or Page Down keys) to change each value to match the list. Then press Esc key to return to Main Menu.
  • CPU to PCI Write Buffer: Enabled
  • CPU to PCI Byte Merge: Enabled
  • PCI to DRAM Buffer: Enabled
TF-486 Motherboard BIOS: Integrated Peripherals Select
BIOS Main Screen: Use arrow keys to highlight "INTEGRATED PERIPHERALS", then press Enter. Integrated Peripherals Screen should appear.
TF-486 Motherboard BIOS: Integrated Peripherals
INTEGRATED PERIPHERALS:
Use arrow keys to highlight IDE HDD Block Mode, and use the "+" or "-" keys (or Page Up or Page Down keys) to change the value to "Enabled". Then press Esc key to return to Main Menu.
TF-486 Motherboard BIOS Main Screen: Save and Exit
BIOS Main Screen:
Press F10 to save and exit, then press Enter. CNC will reboot with the factory default settings.
BIOS Main Screen:
Power up or reboot the CNC, then press Del key to enter CMOS menu. Use arrow keys to highlight "LOAD SETUP DEFAULTS", then press Enter, then press "Y", then press Enter again.
TF-486 Motherboard BIOS Main Screen: Load Setup Defaults
BIOS Main Screen:
Use down arrow to highlight "BIOS FEATURES SETUP", then press Enter. BIOS FEATURES SETUP screen should appear.
TF-486 Motherboard BIOS Main Screen: BIOS Features
BIOS FEATURES SETUP:
Use arrow keys to highlight each of the following six items, and use the "+" or "-" keys (or Page Up or Page Down keys) to change each value to match the list. Then press Esc key to return to Main Menu.
TF-486 Motherboard BIOS Features Menu
BIOS Main Screen:
Use arrow keys to highlight "CHIPSET FEATURES", then press Enter. Chipset Features Screen should appear.
TF-486 Motherboard BIOS Main Screen: CHIPSET FEATURES Select
CHIPSET FEATURES SETUP:
Use arrow keys to highlight the following five items, and use the "+" or "-" keys (or Page Up or Page Down keys) to change each value to match the list. Then press Esc key to return to Main Menu.
TF-486 Motherboard CHIPSET FEATURES Settings
BIOS Main Screen: Use arrow keys to highlight "POWER MANAGEMENT SETUP", then press Enter. Power Management Screen should appear.
TF-486 Motherboard BIOS Main Screen: POWER MANAGEMENT Select
POWER MANAGEMENT SETUP:
Use arrow keys to highlight the following two items, and use the "+" or "-" keys (or Page Up or Page Down keys) to change each value to match the list. Then press Esc key to return to Main Menu.
TF-486 Motherboard BIOS: Power Management Screen
BIOS Main Screen: Use arrow keys to highlight "PCI CONFIGURATION SETUP", then press Enter. PCI Configuration Screen should appear.
TF-486 Motherboard BIOS: PCI Configuration Select
PCI CONFIGURATION SETUP:
Use arrow keys to highlight the following three items, and use the "+" or "-" keys (or Page Up or Page Down keys) to change each value to match the list. Then press Esc key to return to Main Menu.
TF-486 Motherboard BIOS: PCI Configuration Screen
BIOS Main Screen: Use arrow keys to highlight "INTEGRATED PERIPHERALS", then press Enter. Integrated Peripherals Screen should appear.
TF-486 Motherboard BIOS: Integrated Peripherals Select
INTEGRATED PERIPHERALS:
Use arrow keys to highlight IDE HDD Block Mode, and use the "+" or "-" keys (or Page Up or Page Down keys) to change the value to "Enabled". Then press Esc key to return to Main Menu.
TF-486 Motherboard BIOS: Integrated Peripherals
BIOS Main Screen:
Press F10 to save and exit, then press Enter. CNC will reboot with the factory default settings.
TF-486 Motherboard BIOS Main Screen: Save and Exit
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