putting some comments also

@start:
in al,64h
and al,02h
jnz @start
--this subroutine checks if the keyboard buffer is empty and ready for new command. once ready, we send the "ed" command which is for setting leds

mov al,0edh
out 60h,al
---sending "ed" to keyboard port

@wait:
in al,64h
and al,02h
jnz @wait
---since "ed" is a 2byte command and requires the data being sent after it aswell, we must check if the buffer is ready for data

mov al,0111b
out 60h,al
end;
--here we send data which asks keyboard controller to light up all 3 LEDs

DOSBox doesn't emulate this

ok I see.

it doesnt work under windows xp also and neither does it work in command prompt window which is kinda emulating of dos too afaik.

does this problem have any workaround at all or only way to get it working is installing pure dos/booting into dos?

thanks

You could add it to DOSBox yourself, however it is unlikely that this will find it's way in the official release.

http://www.codegod.de/WebAppCodeGod/keyboard- … led-AID118.aspx