From: Dan Olson <dano@agora.rdrop.com>
To: jb1@btstream.com
Cc: elks <linux-8086@vger.kernel.org>
Subject: Re: hardware questions
Date: Sat, 30 Nov 2002 19:09:00 -0800 (PST) [thread overview]
Message-ID: <20021130190533.B93589-100000@agora.rdrop.com> (raw)
In-Reply-To: <Pine.LNX.4.33.0211300243210.6929-100000@olympus.btstream.com>
> Watch out for address line A20. The IBM and clones use it, but it actually
> comes from an I/O pin on the keyboard controller rather than the CPU.
> Sorry, I don't remember any details.
>
> The Intel databook for the 8088 is titled "iAPX 88 Book". Mine is dated
> July 1981, and has stickers on it indicating that it was actually
> published by Reston Publishing Company, Inc., a Prentice-Hall company. No!
> I won't part with it!
Thanks, maybe this kind-of leads into what has been confusing me a little,
that being how the 8086 and the newer 16 bit data bus CPUs talk to other
devices on the bus. I only see a need for 19 of the 20 address lines
because only even addresses would be needed, the odd and even bytes would
both be transfered at the same time. I'll keep hunting for more
information.
Dan
prev parent reply other threads:[~2002-12-01 3:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-15 8:00 ELKS in space Paul Nasrat
2002-10-15 15:29 ` Miguel Bolanos
2002-11-29 23:34 ` hardware questions Dan Olson
2002-11-30 11:02 ` jb1
2002-12-01 3:09 ` Dan Olson [this message]
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