Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
Exit
Terminate a Process Function Call 4CH
Terminates the current process and transfers control to the in-
voking process. In addition,
a return code may be sent. All files
open
at the time are closed.
This method is preferred over all others (Interrupt
20H,
JMP 0).
Entry Conditions:
AH = 4CH
AL = return code
Error Returns: None.
Example:
Exec equ 4CH
mov al, code
mov ah, Exit
Int 21 H
~~~
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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