Davex/doc/help/Mon

mon -- enter the Monitor

syntax:  mon

ex:      mon

Dumps you into your Apple's monitor.  Ctrl-Y or RESET or 
3D0G will get you back to Davex.  (On an Apple IIgs, Q will 
do it, too.)

(If the only kind of "monitor" you care about is the one 
you're looking at right now, this command isn't for 
you--it's for people addicted to machine language.)