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HELLO.ASM
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Assembly Source File
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1996-02-21
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2KB
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48 lines
; Turbo Assembler example. Copyright (c) 1993 By Borland International, Inc.
; From the Turbo Assembler User's Guide - Getting started
.MODEL SMALL
.STACK 100h
.DATA
TimePrompt DB 'Is it after 12 noon (Y/N)?$'
GoodMorningMessage DB 13,10,'Good morning, world!',13,10,'$'
GoodAfternoonMessage DB 13,10,'Good afternoon, world!',13,10,'$'
DefaultMessage DB 13,10,'Good day, world!',10,13,'$'
.CODE
start:
mov ax,@data
mov ds,ax ;set DS to point to the data segment
mov dx,OFFSET TimePrompt ;point to the time prompt
mov ah,9 ;DOS: print string
int 21h ;display the time prompt
mov ah,1 ;DOS: get character
int 21h ;get a single-character response
or al,20h ;force character to lower case
cmp al,'y' ;typed Y for afternoon?
je IsAfternoon
cmp al,'n' ;typed N for morning?
je IsMorning
mov dx,OFFSET DefaultMessage ;default greeting
jmp DisplayGreeting
IsAfternoon:
mov dx,OFFSET GoodAfternoonMessage ;afternoon greeting
jmp DisplayGreeting
IsMorning:
mov dx,OFFSET GoodMorningMessage ;before noon greeting
DisplayGreeting:
mov ah,9 ;DOS: print string
int 21h ;display the appropriate greeting
mov ah,4ch ;DOS: terminate program
mov al,0 ;return code will be 0
int 21h ;terminate the program
END start