OSDev.org

Posted: **Fri Mar 16, 2012 2:07 am**

Hi,

Was trying to work out why this instruction causes padding in high memory. E.g "[memory location],00" after the instruction and ModRM byte.

Code I'm getting is:

Code: Select all

8A 16 C1 00 to represent mov dl, byte [memory]

Jim

Posted: **Fri Mar 16, 2012 2:29 am**

There is no such thing as an 8 bit absolute address. You're running in 16 bits mode and therefore the absolute address is 16 bits wide (and occupies two bytes).

Posted: **Fri Mar 16, 2012 3:03 am**

Ah I see, thanks!

OSDev.org

Mov al, byte [memory] - adding padding?

Mov al, byte [memory] - adding padding?

Re: Mov al, byte [memory] - adding padding?

Re: Mov al, byte [memory] - adding padding?