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    The Intel 8086 / 8088 / 80186 / 80286 / 80386 / 80486 Instruction Set

    This HTML version of the file intel.doc from the PC Game Programmer's guide was produced by , veritasNOSPAM@comcast.net. Fancy HTML modifications are copyright © 2005 by , all rights reserved. This information is provided in the hope that it will be useful, but without any warranty; it is provided AS-IS, without even the implied warranty of fitness for a particular purpose.

    X Instructions

    XCHG - Exchange
     
        Usage:  XCHG    dest,src
        Modifies flags: None
    
        Exchanges contents of source and destination.
    
                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes
        reg,reg           4     3     3     3             2
        mem,reg         17+EA   5     5     5            2-4  (W88=25+EA)
        reg,mem         17+EA   5     5     3            2-4  (W88=25+EA)
        accum,reg         3     3     3     3             1
        reg,accum         3     3     3     3             1
    

    XLAT/XLATB - Translate
     
        Usage:  XLAT    translation-table
                XLATB   (masm 5.x)
        Modifies flags: None
    
        Replaces the byte in AL with byte from a user table addressed by
        BX.  The original value of AL is the index into the translate table.
        The best way to describe this is MOV AL,[BX+AL]
    
                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes
        table offset      11    5     5     4             1
    

    XOR - Exclusive OR
     
        Usage:  XOR     dest,src
        Modifies flags: CF OF PF SF ZF (AF undefined)
    
        Performs a bitwise exclusive OR of the operands and returns
        the result in the destination.
    
                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes
        reg,reg           3     2     2     1             2
        mem,reg         16+EA   7     6     3            2-4  (W88=24+EA)
        reg,mem          9+EA   7     7     2            2-4  (W88=13+EA)
        reg,immed         4     3     2     1            3-4
        mem,immed       17+EA   7     7     3            3-6  (W88=25+EA)
        accum,immed       4     3     2     1            2-3
    



    © Zack Smith