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<title>Parallel Port Programming: x86 Assembly</title>
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<h2>Parallel Port Programming: x86 Assembly</h2>
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<p>Assembly language programming can often be complicated, but
writing to the parallel port in x86 asm isn't too bad. There is
a simple instruction called out. Its format is<br><br>
out accumulator, port<br><br>
The details of this instruction are explained in the comments
below. The program below simply writes the value of 48
to the parallel port.
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<pre>title Parallel Port Writer
; This program writes a single value to the parallel port.
; The out instruction is used. Its format is out accumulator, port
; Accumulator must be AL for 8-bit, or AX for 16-bit. Port may
; be a constant in the range of 0 - FF hex, or a value in DX from
; 0 and FFFF hex.
dosseg
.model small
.stack 100h
.code
main proc
mov al,48 ; 8-bit output value stored in al
mov dx,378h ; parallel port is 378 hex
out dx,al ; write it
mov ax,4C00h ; return to DOS
int 21h
main endp
end main
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