Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
aux-input macro
mov ah,3
int 21 H
endm
aux-output macro character
mov d1,character
mov ah,4
int 21 H
endm
print-char macro character
mov d1,character
mov ah,5
int 21 H
endm
dir-console-iomacro switch
mov dl ,switch
mov ah,6
int 21 H
endm
dir-console-input macro
mov ah,7
int 21 H
endm
read-kbdmacro
mov ah,8
int 21 H
endm
displaymacro string
mov dx,offiet string
mov ah ,9
int 21 H
endm
get-string macro limit,string
mov dx,offsetstring
mov 5tring,limit
mov ah,0AH
int 21H
endm
check-kbd-status macro
mov ah,0BH
int 21 H
endm
flush-and-read-kbd macro switch
mov a1,switch
mov ah,0CH
int 21 H
endm
;AUX-INPUT
;function03H
;AUX-OUTPUT
:function 04H
;PRINT-CHAR
;function 05H
;DIR-CONSOLE-IO
;functionKH
;DIR-CONSOLE-INPUT
;function 07H
;READ-KED
;function 08H
;DISPLAY
:function 09H
;GET-STRING
;function 0AH
;CHECK-KED-STATUS
:functionBBH
;FLUSH-AND-READ-KBD
;function 0CH
138

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