Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
StdC onInput
Keyboard Input Function Call OIH
Waits for a character to be typed at the keyboard, then
echoes the character to the display and returns it in AL.
If the character is CONTROL-C, Interrupt
23H is
executed.
Entry Conditions:
AH = OIH
E xi t Conditions :
AL = character typed
Macro Definition:
read-kbd-and-echo macro
mov ah, OIH
int 21H
endm
Example:
The following program displays and prints characters as
they are typed. If [ENTER] is pressed, the program sends a
Line-FeedKarriage-Return to both the display and the
printer.
func-OIH: read-kbd-and-echo ;THIS FUNCTION
print-char
a1
;5ee Function 05H
CmP al,0DH
;15 it a CR?
1ne func-OIH
;no, print
it
print-char
10
;5ee Function 05H
display-char
10
;5ee Function 02H
Imp func-0lH
;get another character
33

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