Here goes:

Does anyone know how to switch a Compaq Deskpro 8086 from
IBM-compatible 4.77Mz mode to the "turbo" 7Mz mode? I recently picked
up one of these puppies -without OS- and I can't figure the
keystrokes, nor are there any DIP switches to adjust this.

I've already tried the old XT-clone Control-Alt-Plus combo that worked
with XT "turbo" clones, and that one doesn't work. Any suggestions
would be appreciated.