Technical information

iii
Contents
Figures and Tables vii
Preface About This Note
ix
Contents of This Note ix
Supplementary Documents ix
Obtaining Information From APDA x
Conventions and Abbreviations x
Typographical Conventions x
Standard Abbreviations xi
Chapter 1 Introduction
1
Appearance and Features 2
How the DOS Compatibility Card Works 4
Outline of Operation 4
I/O Capabilities 6
Floppy Disk 6
Hard Disk 6
Serial Ports 6
Parallel Printer Port 7
Keyboard and Mouse 7
Sound 7
Video Monitor 8
Game Controller 9
Chapter 2 Hardware Design
11
Processor and Memory System 14
80486DX2 Microprocessor 14
PC System Bus and Devices 14
Cache Snooping 15
Byte Order 15
Misaligned Transfers 15
Interrupts 17
Bus Arbitration 18
Expansion 19
84031 Memory Controller 19
DRAM Control 19
BIOS Control 20
Thi d t t d ith F M k 4 0 4