In/Out - Bochs problem

[Hornet]

Hello.
I'm using the following code to control the lock LEDs:

Code: Select all

mov dx, 0x60
mov ax, 0xED
out dx, ax
mov ax, 0xFF
out dx, ax

This code works in VMware and on my Computer. But Bochs is exiting with the following message:
[KBD ] kbd: io write to address 00000060, len=2!

Can anyone help me?
Hornet (german)

[distantvoices]

bochs protests, when you want to say out [port],ax f. ex. I've had this error in my implementation too.

use al instead. this will work i think. It has to do with the registers length.

p. ex.

mov al,0x20
out 0x20,al

hope this helps.

[Pype.Clicker]

when you use "out dx,ax", what is actually done is sending al on IO[dx] and ah on IO[dx+1]. This is probably not what you want to do. If this was not a typo, I suggest you go back to the keyboard definitions and read it once again.

out 0x60,eax ; out 0x60,ax and out 0x60,al have definitely *NOT* the same behaviour.

[distantvoices]

Have peeked in to my own holy grail of assembly and found out:

al = 8 bit length

ax=16 bit length

eax=32 bit length

Some ports only accept a value which is 8 bits long - in these cases bochs kicks the code out and refuses to continue work. It is a box - what do you expect it to do else?*ggg*