DOS ain't dead

Problem with INT21h/AH=06h in WinXP (Developers)

posted by Laaca , Czech republic, 11.06.2023, 21:40

It seems that WinXP sets differently the ZF flag in case when INT 21h/06h is called for second time to get the code for extended key.


   mov bh,0
   mov ax,0600h
   mov dl,0ffh
   int 21h
jz @nochar      {RBIL says that if the char is not ready, then AL=0 and ZF=1}
   cmp al,0
   jnz @nochar

   int 21h
   inc bh
@nochar:
   mov ah,bh
   mov dos_ascii,ax


The new executable is here.

But still it is not perfect. Under WinXP does not work correctly the key combinations like CTRL+arrow. But under DOS and under Win98 it works fine.

---
DOS-u-akbar!

Complete thread:

• Problem with INT21h/AH=06h in WinXP - Laaca, 11.06.2023, 08:53
  • Problem with INT21h/AH=06h in WinXP - alexfru, 11.06.2023, 18:05
    • Problem with INT21h/AH=06h in WinXP - Laaca, 11.06.2023, 21:40
      • Problem with INT21h/AH=06h in WinXP - RayeR, 13.06.2023, 02:53
        • Problem with INT21h/AH=06h in WinXP - Laaca, 13.06.2023, 11:40
          • Problem with INT21h/AH=06h in WinXP - RayeR, 13.06.2023, 13:30