Path: utzoo!attcan!uunet!husc6!mailrus!ames!amdahl!amdcad!diablo!phil
From: phil@diablo.amd.com (Phil Ngai)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Usable I/O Address range on the PC bus ...
Keywords: Limited to addresses up to 0x0400 only??
Message-ID: <23609@amdcad.AMD.COM>
Date: 22 Nov 88 01:07:32 GMT
References: <5065@whuts.ATT.COM> <4229@encore.UUCP> <1275@cfa.cfa.harvard.EDU> <3626@pt.cs.cmu.edu> <1276@cfa.cfa.harvard.EDU> <15225@iuvax.cs.indiana.edu>
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Reply-To: phil@diablo.AMD.COM (Phil Ngai)
Organization: Advanced Micro Devices, Inc. Sunnyvale CA
Lines: 18

In article <15225@iuvax.cs.indiana.edu> bkliewer@iuvax.UUCP (Bradley Dyck Kliewer) writes:
|Select a 10 bit address and then use 16 bit addresses created from that base
|giving you lots of ports off one IBM-style port.

That's correct. 64 addresses, to be exact.

|Perhaps it worth mentioning that the Micro Channel decodes the full 16 bit
|address, and the EISA specification will probably do the same.

This is totally irrelevant. You're not going to plug your XT bus board
into a micro channel. As for EISA, since it must work with old boards
(or what's the point) and old boards claim all 10-bit aliases, there
is nothing wrong with the LIM technique, even in a post-EISA world. 

--

Phil Ngai, phil@diablo.amd.com
{uunet,decwrl,ucbvax}!amdcad!phil