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"Just came across your Burroughs Sensimatic F200. Looks like you are missing the Carriage and programmable control panel. If it is the F200 on which I worked in the 60's it will have one accumulator (crossfooter) which could handle addition and subtraction including negative figures. It also would have had four registers into which amounts could be added or subtracted, these however could hold a negative number only as a compliment which had to be maniputed to convert back to the correct figire by adding twice and subracting once into the crossfooter. Happy days."