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From: viraf@seas.gwu.edu (Viraf Bankwalla)
Newsgroups: comp.os.msdos.programmer
Subject: Writing an interrupt handler in MSC
Message-ID: <2628@sparko.gwu.edu>
Date: 25 Jan 91 14:40:14 GMT
Reply-To: viraf@seas.gwu.edu ()
Organization: The George Washington University, Washington D.C.
Lines: 21

Hi,

  I wrote an isr for the serial port in MSC 6.0.  All vars were
  defined as static, as I thought this would greatly increase
  the speed.  All worked fine, until I added to the isr.

  On speaking with Microsoft, I was informed that all vars
  used by the isr MUST be globals.  Great, I made the change,
  and my throughput has dropped by over 50 %.  

  On getting an asm listing, I see that most of my time seems
  to be loading the es register with the segment address. 
  How can I bypass this ?? 

  Any help would be greatly appreciated.

  Thanks in advance.

  viraf bankwalla.
  viraf@seas.gwu.edu
  ...!uunet!gwusun!viraf