Tandy 1000 Basic Reference Manual

Chapter 11 / Technical Information 351
Interfacing With Assembly-Language Routines 351
Memory Allocation Outside BASIC’s Work Area 351
Memory Allocation Inside BASIC’s Work Area 351
CALL Statement 353
CALLS Statement 355
USR Function 355
How Variables are Stored
357
Accessing String Variables 358
File Control Block 358
User Installed Devices 361
Information for Creating Child Processes 361
Messages 365
and Derived Functions 375
Charts 379
Keyboard ASCII/Scan Codes 379
ASCII Character Codes 383
Appendix C I Video Display Worksheet 389
Index 393
Chapter 12 / BASIC Error Codes and
Appendix
A / BASIC Reserved Words
Appendix B / Keyboard and Character Code
Appendix
D / Extended Codes 391
5

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