Date: 05 Feb 1993 11:46:07 -0500
From: "Mark H. Wood" <IMHW400 AT INDYVAX DOT IUPUI DOT EDU>
Subject: Re:  Help on 80387 emulator
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Organization: Indiana University - Purdue University at Indianapolis

>A 486 without a FPU?  Sounds broken to me.

I just went through this little shock on another list.  Here's what I'm told:

o	A 486 DX is a complete chip.

o	A 486 SX is a complete chip but with the FPU "disabled".  I suppose
	that they just erased a couple of critical traces on one of the masks.
	Unlike the 386 SX, it has full-width external address and data buses.

o	A 487 "coprocessor" is a 486 DX that knows how to disable your 486 SX
	completely and take over its work.

It sounds just crazy enough to be true.


^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Mark H. Wood, Lead Analyst/Programmer    +1 317 274 0749   [@disclaimer@]
Internet:  IMHW400 AT INDYVAX DOT IUPUI DOT EDU     BITNET:  IMHW400 AT INDYVAX