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From: astieber@csd4.milw.wisc.edu (Anthony J Stieber)
Newsgroups: comp.sys.att,comp.sys.ibm.pc
Subject: Re: ???? Has anyone replaced the 80286 with NEC's V40 (6300+) ?????
Message-ID: <2108@csd4.milw.wisc.edu>
Date: 18 Apr 89 08:43:14 GMT
References: <2103@csd4.milw.wisc.edu> <10021@netnews.upenn.edu>
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Reply-To: astieber@csd4.milw.wisc.edu (Anthony J Stieber)
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<<<<<<<<<<<<<<<<<<<<<<<< E A T   T H I S   I N E W S ! >>>>>>>>>>>>>>>>>>>>>>>>

In article <10021@netnews.upenn.edu> silver@eniac.seas.upenn.edu.UUCP (Andy Silverman) writes:
>In article <2103@csd4.milw.wisc.edu> alavi@csd4.milw.wisc.edu (Alavi Ronette Salehi) writes:
>>	I Have an AT&T 6300+ and wanted to know if there is anyone out there
>>	who has replaced the 80286 CPU with a NEC V40 chip. If so what is
>>	the performance improvement?
>>	also what about compatibility?
 
>I got flamed out on this topic a few months ago.  It turns out that the
>80286 can't be replaced with a V40 because the two aren't completely
>pin-compatible.  So sorry.  Am I wrong?  I'm pretty sure that this is
>the case.
>+----------------+-----------------------------------------+
>| Andy Silverman | Internet:   silver@eniac.seas.upenn.edu |
>|     "Why?"     | Compu$erve: 72261,531                   |
>+----------------+-----------------------------------------+

The NEC Microcomputer Products Databook 1987 describes the V40 as an 8/16
bit microprocessor, the 80286 is a full 16 bits.  The V50 is described as
a V40 but with a 16 bit data buss.  These two V-series chips seem to
be clones on the Intel 8018x processors with 8080 emulation.  The V60 chip
appears to be the 80386.  Apparently NEC never got a license to fabricate
the 80286, in fact I think Harris was to the only company to second source
that chip.
--
Tony Stieber	astieber@csd4.milw.wisc.edu
	"Electrons never die, they just go to the old volts home."