User manual TYAN TOMAHAWK BX

[. . . ] Tyan S1856 Tomahawk BX/A+ Motherboard User's Manual Revision 1. 00 Copyright © Tyan Computer Corporation, 1999. No part of this manual may be reproduced or translated without prior written consent from Tyan Computer Corp. All registered and unregistered trademarks and company names contained in this manual are propery of their respective companies including, but not limited to the following. S1856 Tomahawk BX and Tomahawk A+ are trademarks of TYAN Computer Corporation. Information contained in this publication has been carefully checked for accuracy and reliability. In no event will Tyan Computer be held liable for any direct or indirect, incidental or consequential damage, loss of use, loss of data, or other malady resulting from errors or inaccuracies of information contained in this manual. [. . . ] Lines in your config. sys file that start with loadhigh load programs into high memory. BIOS Features Setup The screen (shown on the following page) contains industry-standard options additional to the core PC AT BIOS. This section describes all fields offered by Award Software in this screen. Your system board designer may omit or modify some fields. http://www. tyan. com 40 ROM PCI/ISA BIOS (2A5LET59) BIOS FEATURES SETUP AWARD SOFTWARE, INC. Virus Warning CPU Internal Cache External Cache Quick Power On Self Test CPU L2 Cache ECC Checking Boot Sequence Swap Floppy Drive Boot Up Floppy Seek Boot Up NumLock Status IDE HDD Block Mode Gate A20 Option Memory Parity/ECC Check Typematic Rate Setting Typematic Rate (Chars/Sec) Typematic Delay (Msec) Security Option PCI/VGA Palette Snoop OS Select For DRAM > 64MB : Disabled : Enabled : Enabled : Disabled : Disabled : A, C, SCSI : Disabled : Enabled : On : Disabled : Normal : Disabled : Disabled :6 : 250 : Setup : Disabled : Non-OS2 Video BIOS Shadow : Enabled C8000-CBFFF Shadow : Disabled CC000-CFFFF Shadow : Disabled D0000-D3FFF Shadow : Disabled D4000-D7FFF Shadow : Disabled D8000-DBFFF Shadow : Disabled DC000-DFFFF Shadow : Disabled ESC : Quit : Select Item F1 : Help PU/PD/+/- : Modify F5 : Old Values (Shift)F2 : Color F6 : Load BIOS Defaults F7 : Load Setup Defaults BIOS Feature Setup - Default Settings Chart Setting Option Virus Warning CPU Internal Cache External Cache CPU L2 Cache ECC Checking Quick Pow er On Self Test Boot Sequence Sw ap Floppy Drive Boot Up Floppy Seek Boot Up NumLock Status IDE HDD Block Mode Gate A20 Option Memory Parity / ECC Check Typematic Rate Setting Typematic Rate (Chars/Sec) Typematic Delay (Msec) Security Option PCI / VGA Palette Snoop OS Select For DRAM > 64MB Video BIOS Shadow C8000-CBFFF Shadow CC000-CFFFF Shadow S1856 Tomahawk BX/A+ BIOS BIOS Default Disabled Enabled Enabled Enabled Disabled A, C, SCSI Disabled Enabled On Disabled Normal Disabled Disabled 6 250 Setup Disabled Non-OS2 Enabled Disabled Disabled Setup Default Disabled Enabled Enabled Enabled Enabled A, C, SCSI Disabled Enabled On Enabled Fast Disabled Disabled 6 250 Setup Disabled Non-OS2 Enabled Disabled Disabled 41 Chapter 3 BIOS Configuration Settings Chart (Continued) Setting Option D000-D3FFF Shadow D4000-D7FFF Shadow D8000-DBFFF Shadow DC000-DFFFF Shadow BIOS Default Disabled Disabled Disabled Disabled Setup Default Disabled Disabled Disabled Disabled Virus Warning When enabled, you receive a warning message if a program (specifically, a virus) attempts to write to the boot sector or the partition table of the hard disk drive. Keep in mind that this feature protects only the boot sector, not the entire hard drive. Note: Many disk diagnostic programs that access the boot sector table can trigger the virus warning message. If you plan to run such a program, we recommend that you first disable the virus warning. CPU Internal Cache/External Cache Cache memory is additional memory that is much faster than conventional DRAM (system memory). CPUs from 486-type on up contain internal cache memory, and most, but not all, modern PCs have additional (external) cache memory. When the CPU requests data, the system transfers the requested data from the main DRAM into cache memory, for even faster access by the CPU. The External Cache field may not appear if your system does not have external cache memory. CPU L2 Cache ECC Checking Enables Error Checking and correction (ECC) on the L2 cache onboard the CPU. Quick Power On Self Test Select Enabled to reduce the amount of time required to run the power-on selftest (POST). Boot Sequence The original IBM PCs loaded the operating system from drive A (floppy disk), so IBM PC-compatible systems are designed to search for an operating system first on drive A, and then on drive C (hard disk). However, modern computers usually load the operating system from the hard drive, and may even load it from a CD-ROM drive. The BIOS now offers a large number of boot devices and boot sequence options. http://www. tyan. com 42 Swap Floppy Drive This field is effective only in systems with two floppy drives. Selecting Enabled assigns physical drive B to logical drive A, and physical drive A to logical drive B. Boot Up Floppy Seek When Enabled, the BIOS tests (seeks) floppy drives to determine whether they have 40 or 80 tracks. Only 360-KB floppy drives have 40 tracks; drives with 720 KB, 1. 2 MB, and 1. 44 MB capacity all have 80 tracks. Because very few modern PCs have 40-track floppy drives, we recommend that you set this field to Disabled to save time. Boot Up NumLock Status Toggle between On or Off to control the state of the NumLock key when the system boots. When toggled On, the numeric keypad generates numbers instead of controlling cursor operations. IDE HDD Block Mode Enables multi-sector transfers from the IDE drive in PIO mode. BIOS Gate A20 Option Gate A20 refers to the way the system addresses memory above 1 MB (extended memory). [. . . ] A pipeline can be likened to an assembly line, with a given part of the pipeline repeatedly executing a set part of an operation on a series of instructions. PM timers (Power Management timers) are software timers that count down the number of seconds or minutes until the system times out and enters sleep, suspend, or doze mode. PnP is an acronym for Plug and Play, a design standard that has become ascendant in the industry. Novice end users can simply plug them into a computer that is running on a Plug and Play-aware operating system (such as Windows 95), and go to work. Devices and operating systems that are not Plug and Play require you to reconfigure your system each time you add or change any part of your hardware. The term RAM (Random Access Memory), while technically referring to a type of memory where any byte can be accessed without touching the adjacent data, is often used to refer to the system's main memory. [. . . ]