From owner-freebsd-hackers Sun Sep 28 17:33:25 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id RAA03771 for hackers-outgoing; Sun, 28 Sep 1997 17:33:25 -0700 (PDT) Received: from sendero-ppp.i-connect.net (sendero-ppp.i-Connect.Net [206.190.143.100]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id RAA03748 for ; Sun, 28 Sep 1997 17:33:16 -0700 (PDT) Received: (qmail 16299 invoked by uid 1000); 29 Sep 1997 00:33:37 -0000 Message-ID: X-Mailer: XFMail 1.2-alpha-092597 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <199709282256.PAA18439@usr07.primenet.com> Date: Sun, 28 Sep 1997 17:33:37 -0700 (PDT) Organization: Atlas Telecom From: Simon Shapiro To: Terry Lambert Subject: Re: INB question Cc: hackers@FreeBSD.ORG, (Tony Overfield) Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Hi Terry Lambert; On 28-Sep-97 you wrote: > > Port 0x18, on many systems, is an alias of port 0x08, which is > > the read-only DMA status register and the write-only DMA command > > register. Likewise, port 0x1A is often an alias of the write-only > > port 0x0A DMA mask register. > > Peachy. I suppose this was done "for no good reason", as usual in > PC hardware design. 8-(. At the time, it probably saved a nickel by saving some address latch. A nickel, times some millions is lots of money. What percentage of the profit it represents? Who cares. Greed is greed. > > Terry Lambert > terry@lambert.org > --- > Any opinions in this posting are my own and not those of my present > or previous employers. --- Sincerely Yours, Simon Shapiro Atlas Telecom Senior Architect 14355 SW Allen Blvd., Suite 130 Beaverton OR 97005 Shimon@i-Connect.Net Voice: 503.799.2313