Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
AuxInput
Auxiliary Input Function Call 03H
Waits for a character from the auxiliary input device, and
then returns the character in AL. No status
or error code
is returned.
If CONTROL-C is typed at console input, Interrupt 23H is
executed.
Entry Conditions:
AH = 03H
E xi t Conditions:
AL = character returned
Macro Definition:
aux-input macro
mov ah,83H
int
21H
endm
Example:
The following program prints characters as they are re-
ceived from the auxiliary device. It stops printing when
an end of file character (ASCII 26,
or CONTROL-Z) is
received.
f unc-03H: aux-input ;THIS FUNCTION
cmp al,lAH ;end of file7
le continue
;yes, all done
print-char
a1 ;see Function 85H
Imp func-83H ;get another character
continue ret
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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