   Help with (Intel) assembly language, converting hex to binary and back...
  I am trying to write a hex calculator where you input two hex numbers and then a operation (+, -, *, /). To do this I need to first convert the hex numbers to binary then do the calculation then convert back, yet I am stuck doing the conversions. I know how to do it on paper, but not in assembly language. Somehow I don''t see being able to just say if the hex is "a" then make "1010" 
  Hm, I''m kind of confused, do you want to convert the string "a" into the string "1010"? Or do you want to convert the string "a" into something you can do arithmetic (easily) on?Sounds mysteriously much like your average homework to me... ;  If you don''t know assembly language well enough to figure out an approach for yourself, why not use a lookup table?It''s the method I used until I got adventurous enough to do it ''properly'' in assembler. StevieDon''t follow me, I''m lost. 