Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
Abort
Terminate Program Function Call OOH
Terminates a program. This function is called by Interrupt
20H, and performs the same processing.
The following exit addresses are restored from the specified
offsets in the Program Segment Prefix:
Program terminate
Critical error
CONTROL-C
OAH
OEH
12H
All file buffers are written to disk. Be sure
to close all
files that have been changed in length before calling this
function. If a changed file is not closed, its length will
not be recorded correctly in the disk directory. See Func-
tion Call 10H
for a description of the Close File call.
Entry Conditions:
AH = OOH
CS = segment address of the Program Segment Prefix
Macro Definition:
terminate-program macro
xor ah,ah
int
21 H
endm
Example:
;CS must be equal to PSP values given at program start
;(E5 and DS values)
mov ah,0
int
21H
;There are no returns from this interrupt
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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