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SVLDT in Assembler

SVLDT - Save LDTR and Descriptor


CPU: Cyrix Cx486S/S2/D/D2/DX/DX2
IBM BL486DX/DX2
TI Potomac

Type of Instruction: System

Instruction: SVLDT dest


Description:

dest <- LDTR [selector,shadow_descriptor]

; dest is register and descriptor structure (see below)



Format or Register and Descriptor Structure:
+00 Limit (15-0)
+02 Base (15-0)
+04 Base (23-16)
+05 AR byte
+06 AR2/Limit (19-16)
+07 Base (31-24)
+08 Selector
Length of structure is 10h



Flags Affected: None

CPU mode: (1) and (2) and (3) and [(4A) or (4B)]


1) CPL=0
2) CCR1.bit1=1 ; SMI enable
3) SMAR size > 0
4A) in SMM
4B) CCR1.bit2=1 ; SMAC is on



++++++++++++++++

Physical Form: SVLDT mem80
COP (Code of Operation) : 0FH 7AH [mm 000 mmm]
Clocks IBM BL486DX: 18
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Green Bank Telescope Enables "Intensity Mapping" to Shed Light on Mysteries of Dark Energy

Photo of the Robert C. Byrd Green Bank Telescope.

Using the world's largest, fully steerable radio telescope--the National Science Foundation's Robert C. Byrd Green Bank Telescope (GBT) in W.Va.--an international team of researchers has given astronomers the promise of a new tool for mapping the universe and gaining valuable clues about the nature of the mysterious "dark energy" believed to constitute nearly three-fourths of the universe's mass and energy. "Intensity Mapping" offers the potential for ...

More at http://www.nsf.gov/news/news_summ.jsp?cntn_id=117366&WT.mc_id=USNSF_51&WT.mc_ev=click


This is an NSF News item.

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