ASCII, 01-09-94
M S X -- D O S v e r s i o n 2
=================================
The advanced disk operating system
for MSX 2 computers
CONTENTS Page
1. Introduction ............................... 3
2. Transient Program Environment .............. 4
2.1 Entry from MSX-DOS .................... 4
2.2 Return to MSX-DOS ..................... 4
2.3 Page Zero Usage ....................... 5
2.4 BIOS Jump Table ....................... 8
2.5 RAM Paging ............................ 9
3. MSX-DOS calls .............................. 11
3.1 Calling Conventions ................... 11
3.2 Devices and Character I/O ............. 12
3.3 File Handles .......................... 13
3.4 File Info Blocks ...................... 15
3.5 Environment Strings ................... 18
3.6 File Control Blocks ................... 20
4. Screen Control Codes ....................... 22
5. Mapper Support Routines .................... 24
5.1 Mapper Initialization ................. 24
5.2 Mapper Variables and Routines ......... 24
5.3 Using Mapper Routines ................. 26
5.4 Allocating and Freeing Segments ....... 27
5.5 Inter-Segment Read and Write .......... 28
5.6 Inter-Segment Calls ................... 29
5.7 Direct paging routines ................ 30
6. Errors ..................................... 32
6.1 Disk Errors ........................... 33
6.2 MSX-DOS Function Errors ............... 35
6.3 Program Termination Errors ............ 40
6.4 Command Errors ........................ 41
This document describes the interface to transient programs provided by
MSX-DOS version 2.20.
1. INTRODUCTION
=================
This manual describes the environment which MSX-DOS 2 provides for
transient programs on MSX 2 computers. It is intended as a guide for writing
new programs to run under MSX-DOS 2 and also to assist in converting existing
CP/M and MSX-DOS 1 programs to take advantage of the advanced features.
MSX-DOS 2 provides many enhancements to the standard CP/M and MSX-DOS 1
environment, but is largely compatible with existing programs. The main
features include:
MS-DOS style tree structured directories
File handles
Environment Strings
Proper error handling
Many extra DOS calls are implemented, and these are accessed via the DOS
entry jump at address 5 (the 'BDOS' jump in CP/M). The descriptions of the
individual functions can be found in the MSX-DOS 2 Function Specification.
Throughout this manual, the term MSX-DOS is used generally to refer to
MSX-DOS 2 unless otherwise stated.
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