Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
Exit Conditions:
Carry set:
AX
= error code
Carry not set:
No error.
Error Returns:
AX = 1
Invalid function. The function passed in AL was not
0, 1, or 3.
Bad environment. The environment was larger than
32K bytes .
Bad format. The file pointed to by DS:DX was an
EXE format file and contained information that was
internally inconsistent.
Not enough memory. There was not enough memory
for the process to be created.
File not found. The path specified was invalid or not
found.
Example:
AX = 10
AX = 11
AX = 8
AX = 2
Exec 9" 4BH
Ids dx, pathname
le5 br, black
mov al, function
mov ah, Exec
Int
21 H
128

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