I have a 770 with OS 2006. I followed the thread, went to http://pupnik.de/dosbox.html , downloaded the 0.72 OS2006 deb, downloaded the libs with red pill, installed xbkd and was able to run Microsoft Quick C and other programs.
But I have some doubts. First, confirm that dosbox.conf should be in /home/user/.dosboxrc
Second, the keyboard layout is in /usr/share/xkbd/en_GB.qwerty.xkbd or in
/usr/bin/dosboxkbd ?
Moreover, I am using the standard xkbd configuration (the two keyboards seems baroque) and I don't know how to produce F1,F2 (function keys). Probably, a guide on your web site will help.