Selecting Ref Or Reg- Mode - Casio QT 6600 - 64 MB RAM Reference Manual

Refund Mode
5. Refund mode operation
5-1. Selecting REF or REG– mode
R-162
The general procedure for entering the REF or REG– mode is as follows.
After sign on operation, press the <MODE> key and select the <RF> or <REG-> key to
turn that mode.
Refund registration or register minus (REG–) registration starts with this operation.
Note: Key operations are similar to that in the register mode.
To avoid miss-registration in the REF or REG– mode, return the mode to the former
one immediately.