(BIOS

.IV

Features)

BIOS

 

 

IV. BIOS SOFTWARE

Boot Sequence (C,A)

This field determines where the system looks first for an operating system. Options are C,A; A,CDROM,C; CDROM,C,A; D,A; E,A; F,A; A,C and C only; The setup default setting is to check first the hard disk and then the floppy disk drive; that is, C, A.

Boot Up Floppy Seek (Disabled)When enabled, the BIOS will seek drive A one time.Floppy Disk Access Control (R/W)

This allows protection of files from the computer system to be copied to floppy disk drives by allowing the setting of Read Only to only allow reads from the floppy disk drive but not writes. The setup default R/W allows both reads and writes.

IDE HDD Block Mode Sectors (HDD MAX)

This field enhances hard disk performance by making multi-sector transfers instead of one sector per transfer. Most IDE drives, except older versions, can utilize this feature. Selections are HDD MAX, Disabled, 2, 4, 8, 16, and 32.

Security Option (System)

This field determines when the system prompts for the password. The default setting is System, where the system prompts for the User Password every time you boot up. The other option is Setup, where the system always boots up, and prompts for the Supervisor Password only when the Setup utility is called up. You can specify a password by using the Supervisor Password or User Password option from the main screen as explained later in this section.

PS/2 Mouse Function Control (Auto)

The default of Auto allows the system to detect a PS/2 Mouse on bootup. If detected, IRQ12 will be used for the PS/2 Mouse. IRQ12 will be reserved for expansion cards if a PS/2 Mouse is not detected. Disabled will reserve IRQ12 for expansion cards and therefore the PS/2 Mouse will not function.

PCI/VGA Palette Snoop (Disabled)

Some display cards that are nonstandard VGA such as graphics accelerators or MPEG Video Cards may not show colors properly. The setting Enabled should correct this problem. Otherwise leave this on the setup default setting of Disabled.

OS/2 Onboard Memory > 64M (Disabled)

When using OS/2 operating systems with installed DRAM of greater than 64MB, you need to Enable this option otherwise leave this on the setup default of Disabled.

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Video ROM BIOS Shadow (Enabled)

This field allows you to change the video BIOS location from ROM to RAM. Relocating to RAM enhances system performance, as information access is faster than the ROM.

C8000-CBFFF to DC000-DFFFF (Disabled)

These fields are used for shadowing other expansion card ROMs. If you install other expansion cards with ROMs on them, you will need to know which addresses the ROMs use to shadow them specifically. Shadowing a ROM reduces the memory available between 640KB and 1024KB by the amount used for this purpose.

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ASUS TXP4 User’s Manual