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From: chip@t4test.UUCP
Newsgroups: net.micro
Subject: Re: Does the 80187 exist?
Message-ID: <592@t4test.UUCP>
Date: Thu, 24-May-84 12:45:43 EDT
Article-I.D.: t4test.592
Posted: Thu May 24 12:45:43 1984
Date-Received: Mon, 28-May-84 05:38:36 EDT
References: <2545@tektronix.UUCP>
Organization: Intel, Santa Clara, Ca.
Lines: 27

>  From: bennety@tektronix.UUCP (Bennet Yee)
>  
>  Nobdy seems to know anything about this chip - even the Intel Data
>  Books list the 8087 and the 80287 but not the 80187.  Can anyone tell
>  me if there is such a chip

>  From: hsplab@ecsvax.UUCP
>  
>  ...the 8087 does work with the 80186/80188, but because of differences
>  in the bus timing, requires the use of the 82188 interface chip to
>  "complete HOLD/HLDA bus protocol conversion to RQ/GT, synchronizes
>  ready and provides local bus control signals."

That is correct...  The iAPX186/188 bus was designed so that these
parts may use iAPX86/88 peripherals.  There are some differences,
and as the above article points out, some logic is required to get
an 8087 to properly speak to the 80186.  Later this year, the 82188
will be available to simplify this interfacing issue.  As a result,
there is no need for an 80187.  The iAPX286 bus architecture is
quite different from the iAPX86, and accordingly an 80287 is required
for numerics coprocessing.


-- 
        Chip Rosenthal, Intel/Santa Clara
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