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From: Rugxulo <rugxulo AT gmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Dos programming
Date: Fri, 20 Mar 2009 18:55:10 -0700 (PDT)
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,

On Mar 20, 2:32=A0pm, DJ Delorie <d DOT  DOT  DOT  AT delorie DOT com> wrote:
> > AFAICT, there aren't many DOS .sys device drivers with source.
>
> Here, have another one. =A0It's only 21 years old but should still
> useful :-)
>
> I probably have a bunch more kicking around, too, although most of my
> utilities were TSRs, not device drivers.

I actually saw a tweaked version of this (from 1992, slightly updated
by David Kirschbaum, Robert M. Ryan) about a year ago. Obviously the
most surprising things about it were the age and the original
author!   :-)

ftp://garbo.uwasa.fi/pc/keyboard/buf160_6.zip

; v1.6a, 2-29-92, Robert M. Ryan
; - Added CLI and STI in installation routine. (hgm)
;
; v1.6,	 2-26-92, Robert M. Ryan
; - On conditional assembly of PRIVATESTACK, this program will create
it's
;   own stack.	This was implemented due to problems on some older PCs.
; - Refine checking of segment boundries, based upon recommendation by
;   Harry McGavran (hgm AT moki DOT lanl DOT gov)
; - Added missing a LES before stuffing data into driver header. (also
hgm)
; - Eliminated unnecessary structures and generally cleaned up code.
; - Changed name to BUF160, rather than BUF160_4, BUF160_5, etc.
;
; v1.5 10-23-91 Robert M. Ryan
; - using PUSHA and SHL AX,4 on conditional assembly for 286
; - changed the default buffer status to have TRANSFER enabled, so
that
;   keys pressed during initialization are preserved.
; - changed case of es and ds to be like the rest of the registers
; - added initialization of BX so Cmd_Init would work
; - slightly modified initialization message
;
; Rob Ryan, Brown University
; Robert_Ryan AT brown DOT edu or 70324 DOT 227 AT CompuServe DOT Com
;
; v1.4 09-26-88 Toad Hall Tweak
; - Donno WHY all the public mess.  Leaving it, tho.
; - Donno why author commented out the buffer transfer code.
;   I guess, since we're loading as a driver right at system startup,
;   there shouldn't BE anything in the old keyboard buffer.
;   Driver works fine with TRANSFER enabled (1), but donno what good
it
;   does.  Therefore leaving the default (and compiled driver) OFF
(0).
; - Changed case: constants UPPERCASE, procedures mixed Upper_Lower,
;   variables remain lowercase.	 (Helps to keep my head straight.)
; - Added some comments.
; - Moved Force inline (since only called once)
; - Using string commands in Transfer_Buffer (lodsw, stosw)
; - Just below Transfer_Done, recoded to use AX when stuffing words
;   into variables (faster than old code using CX).