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Monster Media 1994 #1
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PROG_GEN
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PMODE24.ZIP
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EX_PM0.ASM
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Assembly Source File
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1994-02-04
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2KB
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43 lines
; A simple program to print a message using DOS INT 21h AH=9.
.386p
code32 segment para public use32
assume cs:code32, ds:code32
include pmode.inc
public _main
;▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
; DATA
;▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
message db 'Hello World.$'
;▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
; CODE
;▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
;═════════════════════════════════════════════════════════════════════════════
_main:
sti
mov eax,offset message ; get offset of message in protected mode
add eax,_code32a ; adjust to an absolute address
shld ebx,eax,28 ; shift bits 4-31 of EAX into 0-28 of EBX
; though we only care for bits 4-19 of EAX
; that is the segment from the absolute addx
and eax,0fh ; and off the segment from EAX
; now BX:AX is the seg:off of the message
mov v86r_ds,bx ; put segment into virtual reg for real mode
mov v86r_dx,ax ; put offset into virtual reg for real mode
mov v86r_ah,9 ; AH=9 for call to real mode INT 21h
mov al,21h ; interrupt number to call
int 33h ; do real mode INT AL
jmp _exit
code32 ends
end