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From: aubrey@val.UUCP (Aubrey McIntosh)
Newsgroups: comp.windows.ms
Subject: Windows 2.10 on XT with NEC V20.
Summary: Windows 2.10 does boot and run write, clock, calc with NEC V20.
Keywords: V20, 2.10, protected mode '286 instructions absent.
Message-ID: <319@val.UUCP>
Date: 6 Apr 89 15:49:49 GMT
Reply-To: aubrey@val.UUCP (Aubrey McIntosh)
Organization: Video Associates Labs - Austin, TX
Lines: 33

Several weeks ago, folks questioned whether 2.10 runs on an XT, and
several resounding NOs came forth.

I had obtained a NEC V20 ($8-10) to support a program I use which
uses lots of non standard segment:offset addressing modes, and late
one night I was monkeying around with SYMDEB.  Just assembling one
liners and tracing through them...

NEC V20 supports
  push immediate
  enter
  leave
  push all
  pop all
  <whatever the shift mnemonic is> r,<constant other than 1> :-)
  ...
Off the top of my head, I couldn't think of any '286 instructions for
real mode in addition to these.  So I brought Windows 2.10 home and
brought it up.  Checked out the Clock, Calc, and Write.  Turned it
off and went away...

I suspect that other code, such as the '286 version of Logitech's 
Modula-2 compiler, would run on an XT with a V20 also.  Would like
to hear stories from others.




-- 
Whatcha' call a boomerang that doesn't come back?      --Lost--
--------------------------------------------------------------
1-(512)-346-5781 (v)                                Using Modula-2.     
Austin, TX 78759   ...!cs.utexas.edu![dell|oakhill|kvue]!val!aubrey