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Extensa 500 Notebook Service Guide Service Guide files and updates are available on Acer Intranet and CSD database on Lotus Notes. For more detailed information, please refer to Service CD kit. Copyright Copyright * 1996 by Acer Incorporated. All rights reserved. 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, chemical, manual or otherwise, without the prior written permission of Acer Incorporated. Disclaimer Acer Incorporated makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties of merchantability or fitness for any particular purpose. Any Acer Incorporated software described in this manual is sold or licensed "as is". Should the programs prove defective following their purchase, the buyer (and not Acer Incorporated, its distributor, or its dealer) assumes the entire cost of all necessary servicing, repair, and any incidental or consequential damages resulting from any defect in the software. Further, Acer Incorporated reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of Acer Incorporated to notify any person of such revision or changes. Acer is a registered trademark of Acer Incorporated. Intel is a registered trademark of Intel Corporation. Pentium is a trademark of Intel Corporation. Other brand and product names are trademarks and/or registered trademarks of their respective holders. PART No: 49.42B02.001...PRINT IN TAIWAN DOC No: SG281-9807A Table of Contents Chapter 1 System Introduction Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Special Keys . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Hardware Configuration and Specification . . . . . . . 17 Memory Address Map . . . . . . . . . . . . . . . . . . 17 Interrupt Channel Assignment . . . . . . . . . . . . 17 DMA Channel Assignment . . . . . . . . . . . . . . . 18 I/O Address Map. . . . . . . . . . . . . . . . . . . . . . . 18 Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 BIOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 System Memory . . . . . . . . . . . . . . . . . . . . . . . 20 DIMM Combinations . . . . . . . . . . . . . . . . . . .