From: rbaltissen@gmail.com   
      
   Hallo allemaal,   
      
      
   Linux is mainly written in C. So I wanted to write an OS written in Turbo   
   pascal. Just for fun and to see if it could be done at all. To be honest, I   
   was suprised how quickly I could manage to get 'A:\>' on the screen.   
      
   But to the subject. I need to implement the DOS routines, INT $21, the   
   routines that handles commands like VER, TIME and DATE. One way I can do it is   
   in assembler like:   
      
      
   procedure INT21; assembler;   
   asm   
     cmp  ah,30h       { get the DOS version}   
     jne  @next   
      
     call DosVersion   
     jmp  @end   
      
   @next:   
     .....   
      
   @end:   
     iret   
   end;   
      
      
   But I prefer an all Turbo Pascal solution, thus:   
      
      
   {$F+}   
   procedure INT21; interrupt;   
   begin   
     .....   
   end;   
   {$F-}   
      
      
   As you can see, just dots. I need to check AH in one or anothe way and I have   
   no idea how. Using REGISTERS doesn't work, I tried in various ways. So how can   
   I check the value of register AH (and all the others of course)?   
      
   Thank you in advance!   
      
      
   Kind regards, Ruud Baltissen   
   www.Baltissen.org   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)