AT Compatible DOS Application

to PC-9800 Series

Considering Software Localization

September 1996
First Edition

Introduction

This is a resource that summarizes the differences in architecture that must be considered when localizing DOS applications developed for PC/AT compatible machines to NEC's PC-9800 series.

This article is for the application developers for the PC-9800 series and is a resource to localize software to the PC-9800
series. Thus, use of this resource for something other than the above is prohibited.

Presently, the PC-9800 series can be divided into two types: PC-9801XX and PC-9821XX series.
In this resource, "PC-9800" is used to describe both types.

If you'd like a complete copy of this document, please email us at 98drp@pc98.com.

Overview

• Memory Map
• To distinguish between AT compatible machines and PC-9800
• I/O Port
• Interrupt Vector
• Bootstrap

Hardware

• Interrupt Controller
• Timer
• Real Time Clock
• Keyboard
• Video
• Serial Port
• Parallel Port
• Mouse
• Floppy Disk
• Hard Disk

BIOS

• Video
• System Structure Information/Memory Size
• Disk
• System Service
• Keyboard
• ROM BASIC
• Bootstrap
• Timer

Copyright, NEC Corporation, 1994. All rights reserved.

MS-DOS are registered trademarks of Microsoft Corporation.

Information in this document is subject to change without notice and does not represent a commitment on the part of NEC Corporation, XLsoft International, or Developer Relations Program USA. This document may not be reproduced by any means including physical, electronic, and photocopying without prior written consent from XLsoft International.

Developer Relations Program USA Telephone +1 714 453 2782
12K Mauchly Fax +1 714 453 8811
Irvine, CA 92718-2306

NEC Corporation
Personal Software Division, 1st Personal C&C Operations Unit
33-7, Shiba 5 Chome, Minatoku, Tokyo 108 Japan
+81 3 3798 6477 Telephone
+81 3 3798 6126 Fax

Rev. 4/95