From: nowhere@nospicedham.never.at   
      
   On 08.03.2020 15:04, R.Wieser wrote:   
   > Wolfgang   
   >   
   >> 81 00 80 FF   add word [bx+si], 0xFF80  ;unsigned   
   >> 83 00 80      add word [bx+si],-128     ;sign extended byte   
   >>   
   >> both do the same ...   
   >   
   > :-) You got me, there are indeed a few more instructions that actually do   
   > consider signed immediate values   
   >   
   > Though did you /have/ to use that particular decimal value ?   As a byte its   
   > one of two special values that can't be negated (made negative), which   
   > rather distracted me. :-p   
      
   NEG AL   
   NOT AL   
      
   use32/64   
   6A 00      push 00  ;32bit Zero /64 bit   
   6A FF      push -1  ;0xFFFFFFFF /64 bit   
      
   and a view more with 83... are quite handy to create short code.   
   __   
   wolfgang   
      
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