Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
ConStringOutput
Display String Function Call 09H
Displays a string of characters. Each character is checked
for CONTROL-C. If
a CONTROL-C is detected, an inter-
rupt
23H is executed.
Entry Conditions:
AH = 09H
DS:DX = pointer to a string to be displayed terminated by
Macro Definition:
a $ (24H)
display macro string
mov dx,offset string
mov ah,09H
int 21 H
endm
Example:
The following program displays the hexadecimal code of the
key that is typed.
table
9 ixt een db 16
crlf db 13,10, "0"
db
"0 1 2 3 4 5 6 7 8 9 AB C D E F "
result db 88 - 00H"
func-09H:read-kbd-and-echo
convert al,sixteen,re5ult[31
display result
J mP f unc-09H
see text for
explanatior of $
see Function 01H
3ee end of chapter
THIS FUNCTION
do it again
42

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