I have an old Compaq deskpro 266MMX
Its in some rough shape. I want to enter the bios, but I don’t know how to enter. does not display key to hit like “DEL” or “F1”. I know this is a silly question, but any help would be great. 
Basicaly keep pressing one of the following keys as soon as it turns on:
F9, F10, F11, F12, Del.
Compaq’s CMOS is normally entered using F2 or F10