If you look at flag 4 in the manual, bit 1 sets the commercial message at the top or bottom so you could set it to the bottom to use it as a footer message.
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If anyone needs more information, C-tech collective have the Towa / Geller AX-100 manual here:
http://the-checkout-tech.com/manuals/cashregisters/towa1.php
Registerman, August 2011