DOS73 screen size

[harold.e.bamford]

I have a DOS73 board on my Unix PC.  It supposedly runs a Hercules
card emulation but doesn't display the entire screen at once.
Instead, two of the functions keys are used to scroll the screen up
or down slightly.

Most of the lack of screen space is due to the function key
labels.  This is silly.  I would much rather MARK the keys with a
pencil and have the entire screen.  It is particularly silly when
running a CAD application with status information at the top AND
bottom of the screen...

Does anybody know of a way to fix this?  Possibly a binary patch to
the software to turn off the screen labels when running DOS and
increase the size of the display?

Help!

-- Harold