User manual AOPEN AX6BC

[. . . ] AX6BC User's Guide Printed in Taiwan PART NO. : 49. 87822. 081 DOC. NO. : AX6BC-1-E9904E AX6BC Mainboard User's Guide Document Number Model and revision Manual version Release Date : AX6BC-1-E9811D : For AX6BC rev 1. xx : English, rev D : Nov 23, 1998 More help for latest information: Taiwan USA http://www. aopen. com. tw http://www. aopen-usa. com http://www. aopenusa. om http://www. aopenamerica. com Europe http://www. aopen. nl Copyright Copyright © 1998 by this company. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, manual or otherwise, without the prior written permission of this company. ii Disclaimer This company makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties, merchantability or fitness for any particular purpose. Any software described in this manual is sold or licensed "as is". [. . . ] They are important parameters affects SDRAM performance, default is Auto. If you install DIMMs with SPD and set this item to Auto, BIOS will automatically detect your DIMMs and then set to a appropriate timing; If you use DIMMs without SPD and set this item to Auto, BIOS will set it to 3/3. To make sure all of these settings in BIOS are correct, it is recommended to use DIMMs with SPD. Chipset Features SDRAM RAS# Precharge 2T 3T Auto SDRAM RAS# Precharge The RAS Precharge means the timing to inactive RAS and the timing for DRAM to do Precharge before next RAS can be issued. The default setting is Auto. Chipset Features DRAM ECC Function Auto Disabled DRAM ECC Function This lets you enable or disable DRAM ECC function. The ECC algorithm has the ability to detect double bit error and automatically correct single bit error. Chipset Features Video BIOS Cacheable Enabled Disabled Video BIOS Cacheable Allows the video BIOS to be cached to allow faster video performance. Chipset Features Video RAM Cacheable Enabled Disabled 3-12 Video RAM Cacheable This item lets you cache Video RAM A000 and B000. AWARD BIOS Chipset Features 8 Bit I/O Recovery Time 1 2 3 4 5 6 7 8 NA 8 Bit I/O Recovery Time For some old I/O chips, after the execution of an I/O command, the device requires a certain amount of time (recovery time) before the execution of the next I/O command. Because of new generation CPU and mainboard chipset, the assertion of I/O command is faster, and sometimes shorter than specified I/O recovery time of old I/O devices. This item lets you specify the delay of 8-bit I/O command by count of ISA bus clock. If you find any unstable 8-bit I/O card, you may try to extend the I/O recovery time via this item. If set to NA, the chipset will insert 3. 5 system clocks. Chipset Features 16 Bit I/O Recovery Time 1 2 3 4 NA 16 Bit I/O Recovery Time The same as 16-bit I/O recovery time. This item lets you specify the recovery time for the execution of 16bit I/O commands by count of ISA bus clock. If you find any of the installed 16-bit I/O cards unstable, try extending the I/O recovery time via this item. If set to NA, the chipset will automatically insert 3. 5 system clocks. Chipset Features Memory Hole At 15M-16M Enabled Disabled Memory Hole At 15M-16M This option lets you reserve system memory area for special ISA cards. The chipset accesses code/data of these areas from the ISA bus directly. Normally, these areas are reserved for memory mapped I/O card. Chipset Features Passive Release Enabled Disabled Passive Release This item lets you control the Passive Release function of the PIIX4E chipset (Intel PCI to ISA bridge). Try to enable or disable it, if you have ISA card compatibility problem. 3-13 AWARD BIOS Chipset Features Delayed Transaction Enabled Disabled Delayed Transaction This item lets you control the Delayed Transaction function of the PIIX4E chipset (Intel PCI to ISA bridge). This function is used to meet latency of PCI cycles to or from ISA bus. Try to enable or disable it, if you have ISA card compatibility problem. Chipset Features AGP Aperture Size (MB) 4 8 16 32 64 128 256 AGP Aperture Size (MB) This item lets you determine the effective size of the AGP Graphic Aperture. Chipset Features Pentium II Micro Codes Enabled Disabled Pentium II Micro Codes The micro codes are used to fix bugs of Pentium II CPU, we strongly recommend to enable this item for system reliability reason. We provide this option for your convenience if you like to test it. Chipset Features Manufacture Frequency Default Depends on the CPU type Manufacture Frequency Default This item only reminds you of the actual CPU frequency while clearing CMOS or pressing "Home" key. The default setting is 233 MHz, you can modify it to match the actual CPU frequency by using the utility - flash. exe. Chipset Features Clock Spread Spectrum On Off Clock Spread Spectrum This item is used to set clock spread spectrum for EMI testing. Normally, you don't need to change the default setting. 3-14 AWARD BIOS Chipset Features System Frequency 233 MHz 266 MHz 300 MHz 333 MHz 350 MHz 400 MHz 450 MHz Manual System Frequency This item lets you set CPU frequency. If you want to set other value, please choose "Manual " to set CPU clock frequency and clock ratio manually. Chipset Features CPU Clock Frequency 66. 8 MHz 68. 5 MHz 75. 0 MHz 83. 3 MHz 100 MHz 103 MHz 112 MHz 133. 3 MHz CPU Clock Frequency This item lets you set external clock (bus clock). The correct setting may vary because of different CPU products, refer to your CPU specification for more details. Chipset Features CPU Clock Ratio 1. 5 2. 0 2. 5 3. 0 3. 5 4. 0 4. 5 5. 0 5. 5 6. 0 6. 5 7. 0 7. 5 8. 0 CPU Clock Ratio Intel Pentium II is designed to have different Internal (Core) and External (Bus) frequency. The default value is 3. 5x. 3-15 AWARD BIOS 3. 5 Power Management Setup The Power Management Setup screen enables you to control the mainboard green features. [. . . ] The more detailed information you give us, the faster we can identify and solve your problem. You can copy this form and fax it to your distributor or send the form via e-mail. For getting better efficiency, we don't recommand you report the problem through phone. B-1 Troubleshooting No display. a. Check all jumper settings to make sure that you have set the proper jumpers, especially those for CPU type, single/dual voltage (P54C/MMX), CPU frequency and ratio. [. . . ]