The only way to clear the bookkeeping data in the machine is with a RAM clear chip, yes. This will not clear the mechanical meters, however. You could record the current data on the mechanical meters on a sheet of paper, and use that as a base.
You could also obtain a RAM clear chip by contacting one of the vendors on the front page or in the classifieds section.
Binary files may not be uploaded or transmitted through this site as they are copyrighted material (yes, even for these ancient machines -- the manufacturers are still very vigilant on enforcing their copyrights, and will look for any opportunity to pounce on a website that allows such transactions).