Tandy 1000 Programmer's Reference Guide

Contents
Chapter 1. System Calls 9
Calling and Returning 9
Hierarchical Directories 10
System Call Descriptions 12
Interrupts 12
Function Calls 25
Categories of Calls 25
Error Codes 25
File Handles 26
ASCIIZ Strings 26
Calling MS-DOS Functions 27
CP/M®
- Compatible Calling Sequence
Treatment of Registers 28
MS-DOS Function Calls in Numeric Order 28
MS-DOS Function Calls in Alphabetic Order
Function Call Reference 32
Macro Definitions for MS-DOS System
Call Examples 137
Interrupts 137
Extended Example of MS-DOS System Calls 143
Chapter 2. MS-DOS Control Blocks and Work Areas
151
File Control Block (FCB) 151
Extended File Control Block 153
Program
Segment 153
Program Segment Prefix 157
Chapter 3. MS-DOS Initialization and
Command Processor
161
Chapter 4. MS-DOS Disk Allocation 165
MS-DOS Disk Directory 166
File Allocation Table (FAT) 168
Console. Printer. and Disk Input/Output Calls
10
27
30
Functions 137
General 142
How to Use the File Allocation Table 170

Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200