From: nowhere@never.at   
      
   Kerr-Mudd,John posted "at the very same time":   
   []   
   >>> shorter without checks and only one branch:   
      
   >> need to add cr lf space skipping   
   >>>  and al,0x4f   
   >>>  cmp al,0x40     ;any U/Lcase or Num   
   >>>  jb +2           ;skip   
   >>>  sub al,0x37     ;add 9 sub 0x40   
      
   >> 10 bytes, with Jxx but no AAx   
   >> ;; 1x becomes num            ; 0A 0D 20 30 41 61 66   
   >>          or  al,0x20         ; 2A 2D 20 30 61 61 66   
   >>          sub al,'a'-0x0A     ; D3 D6 C9 D9 0A 0A 0F  ; 0x57   
   >>          jae havehex   
   >>          add al,'a'-0x0A-'0' ;  -  -  -  0  x  x  x  ; 0x27   
   >>          js  gnc             ; skip cr lf space   
   >> havehex:   
      
   > Sorry to be so slow; 8 bytes:   
      
   > cmp al'0'   
   > jb gnc       ; skip space, cr, lf   
   > and al,0x4F  ; drop numeric '3' prefix, lcase->ucase   
   > aam 0x37     ; add 9 sub 0x40 iff alpha   
      
   mmh, I always avoid AA.. but it may become handy sometimes :)   
   __   
   wolfgang   
      
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