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hello1.asm
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Assembly Source File
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1985-06-03
|
3KB
|
66 lines
name hello
page 55,132
title 'HELLO --- print Hello on terminal'
;
; HELLO utility to demonstrate various parts
; of a functional assembly language program,
; use of segments, and a PC-DOS function call.
;
; Ray Duncan, September 1983
; Converted to .COM file by Jerry D. Stuckle, April, 1984
;
;show use of some EQUATES:
cr equ 0dh ;ASCII carriage return
lf equ 0ah ;ASCII line feed
;
;
;begin the "Code" segment
;containing executable
;machine code
cseg segment para public 'CODE'
;
; First we need to tell the assembler where the segment registers point.
assume cs:cseg,ds:cseg,ss:cseg
;
org 100h ;set the start at 0100h (to make room for the PSP)
;
print proc far ;actual program code
;is completely contained
;in the "procedure" named
;"PRINT".
;
;now put the offset of the
;message text into DX,
mov dx,offset message
;now DS:DX specifies the
;full address of the message.
mov ah,9 ;use the PC-DOS function 9
int 21h ;to print the string.
;
xor ah,ah ;set DOS function 0 (terminate)
int 21h ;and call DOS to end the program
;
print endp ;end of the "procedure"
;named "PRINT"
;
message db cr,lf,'Hello!',cr,lf,'$'
;
cseg ends ;end of the code segment
;containing executable
;program.
;
;the final "End" statement
;signals the end of this
;program source file, and gives
;the starting address of
;the executable program
end print
Press ENTER to continue: rting address of
;the executable program
end print
Press ENTER to continue: