Path: utzoo!attcan!uunet!steinmetz!davidsen
From: davidsen@steinmetz.ge.com (William E. Davidsen Jr)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: v01i016: fract386, creates fractal display v2.1 (part 01/02)
Keywords: fract386, VP/ix
Message-ID: <12689@steinmetz.ge.com>
Date: 29 Nov 88 15:09:13 GMT
References: <588@ctisbv.UUCP>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: General Electric CRD, Schenectady, NY
Lines: 21

In article <588@ctisbv.UUCP> pim@ctisbv.UUCP (Pim Zandbergen) writes:

| This is funny, fract386 runs just fine under VP/ix with SCO Xenix.
| VP/ix emulates a 8086 pc. Can anybody explain this?

  VP/ix requires a 386... the 8086 mode emulates the 8086 addressing
modes (for the most part) but not the instruction set. It really behaves
like DOS running on a 386 machine.

  Over the holidays I'm going to try to port the fractal program to use
32 bit arithmetic in the 287 chip, for older machines, and to CGI for
Xenix people without VP/ix. I don't promise that either will get done,
depending on what parties my wife decides to throw or go to ;-) I'll
post the 287 version here if I get it. I have my own fractal program for
Xenix, which could run on DOS, and I hand coded the innermost loop in 11
80287 instructions. Hopefully I have my notes on programming the 287,
since the manual is just a starting place.
-- 
	bill davidsen		(wedu@ge-crd.arpa)
  {uunet | philabs}!steinmetz!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me