If you're using agetty, you can set the terminal type to use on the agetty command line:
agetty [-ihLmnw] [-f issue_file] [-l login_program] [-I init] [-t time-out] [-H login_host] port baud_rate,... [term]
The term option sets the TERM environment variable when you log in.
I'm sure there's a terminal type that would work -- maybe one of these:
# locate terminfo | grep dumb
/usr/share/terminfo/d/dku7003-dumb
/usr/share/terminfo/d/dumb
/usr/share/terminfo/k/klone+sgr-dumb
# locate terminfo | grep comm
/usr/share/terminfo/c/commodore
Hope that helps!
