DX needed for printing charcter?

David Shih (obento_shih@hotmail.com) Thu, 19 Oct 2000 03:17:28 GMT 

From: "David Shih" <obento_shih@hotmail.com>
Subject: DX needed for printing charcter?
Date: Thu, 19 Oct 2000 03:17:28 GMT



hi all,

in the example on page 9 of our notes on 80386:

push dx
mov  dl, al
mov  ah, 02H
int  21H

is the DX register needed for outputing a character on screen?  and if so, 
why?

also, for Prof. Casas:
if we have a 2-bit mode signal (AB) encoded from a 4-bit control signal 
(CDEF), are we allowed to use something like this
  if CDEF = 0101 then AB = 10
or do we need to simplify the truth table ourselves and control the A and B 
bits with combinational logic?

thanks,

dave
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