🚀 go-pugleaf

In article <912@maytag.waterloo.edu> dmurdoch@watstat.waterloo.edu
(Duncan Murdoch) writes:
|
|I was just looking through the floating point code in a Turbo Pascal program,
|and I see that at one point it sets the precision control bits to 01.  My old
|8087 manual lists codes
|  00 - 24 bits
|  01 - (reserved)
|  10 - 53 bits
|  11 - 64 bits
|Does anyone know what setting it to 01 is supposed to do?  Is it something new
|on the 287, 387 or 486?
|
|Duncan Murdoch

I looked through my collection of reference manuals and they all list 01
as reserved.  Here's where I checked:

	80286 and 80287 Programmer's Reference Manual, 210498-005 (1987)
		Figure 1-5, p1-12.  (In the second section of the book!)
	
	80387 Programmer's Reference Manual, 231917-001 (1987)
		Figure 2-3, p2-6.

	i486(tm) Microprocessor, 240440-001 (1989)
		Figure 2.14, p33.  (bound, 175 page "data sheet")

There must be something tricky going on.  <disclaimer.std> applies.
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