🚀 go-pugleaf

In article <1993Jan22.223208.26443@crd.ge.com>, davidsen@ariel.crd.GE.COM (william E Davidsen) writes:
> In article <ssuchalr.727702732@reading>, ssuchalr@csug3.cs.reading.ac.uk (S. J. Chalker) writes:
> 
> | I am an assembly language programmer used to programming an 8086. I recently
> | purchased a 486 computer and now wish to take full advantage of its powers.
> | I am looking for a book on the subject of programming the 486. Or will a book
> | on the 386 do, and if not, what is the difference from the assembly language
> | programers view?
> 
>   The instructions are the same in user mode, although there are a few
> status flags which are different, I believe. There are a few additional
> quirks in the 486, but the big difference is timing, which makes one
> instriction sequence faster on the 386, and another on the 486.
> 
>   I would look for a 486 manual to be sure.
> 
> -- 
> bill davidsen, GE Corp. R&D Center; Box 8; Schenectady NY 12345
>     Keyboard controller has been disabled, press F1 to continue.

There are a couple of new 486 specific instructions, but nothing that 
can't be implemented with 2 or more 386 instructions.  The intent is to 
make it possible to update semaphores in multi-programming systems on the 486
in one uninterruptable instruction.


robert