CI>Hello everybody! ;)
CI>Is anyone here able tell me how to make direct access to the memory??
CI>I'm very new to assembler so a hints would certainly be very appreciated.
Do you want to access it in real mode or protected mode?  The access methods
are slightly different.
CI>Is it possible at all under Win95 (I am planning fast graphics for the
CI>Winslows)
Unfortunately, *I* am unable to be of much help here, since I don't yet have
Windows 95.
CI>I also like to know which of the following is the quickest :
CI>IF thing1 > 0;
this one is reasonably fast     ; 486 386 286 8086 clocks
        MOV     AX, [thing1]    ;   1   4   5   14
        CMP     AX, 0           ;   1   2   3    4
        JG      @@1             ;   1   3   3    4
                                ;   3   9  11   22
   ; whether it is a jg, jng, ja, or jna, etc. makes little difference, since
   ; they all take the same amount of time.  The times shown are for it not
   ; jumping.
CI>IF Not thing1 = 0;
smart compilers would do this:
        MOV     AX, [thing1]    ;   1   4   5   14
        OR      AX, AX          ;   1   2   2    3
        JNZ     @@1             ;   1   3   3    4
                                ;   3   9  10   21
CI>or is there some other way??
If you're trying to do it through assembly language instead of a high level
language, then you can make a minor speed improvement:
        CMP     [thing1], 0     ;   2   5   6   16
        JNZ     @@1             ;   1   3   3    4
                                ;   3   8   9   20
One clock less for processors before the 486.
CI>I am using it for a transparent filtering procedure. All black should be
CI>"invisible" (or any other color)
If you're trying to do sprite transparency, I suggest using some type of run-
length encoding for the images.
((Cloud))
MauveCloud@juno.com
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