X = Examine. This mode allows you take a daily report but not reset the totals. useful if you want to see how the turnover is going part way through the day.
Z = Rezero. This mode allows you to take a daily report and reset the totals for the next day. this should be performed at the end of each day.
P = Programming mode. Allows you to re-program the register.
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If anyone is looking for a cash register manual, try here:
http://the-checkout-tech.com/
Registerman
September 2012