Things to remember about the old office.

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 Memory Reg.     

Instructions Memory Register and Registers X, Y and A through F:

Memory Register:
This register is used for the storage and retrieval of ongoing information. This register can be changed using the second function control input keys. To transfer information from memory to the X register click on the memory register.

Memory Registers Associated Function Key:
M+X - Memory plus X.
M-X - Memory minus X. 
M CL - Clears memory.
M*X - Memory multiplied by X.
M/X - Memory divided by X.
M^X - Memory to the X power.

Registers X, Y and A through F:
The X and Y register are the active input registers. Registers A through F maintain the results of previous calculation and as input registers for various function. The value in registers A through F can be transferred to the X register by clicking on the register.

Special Key Functions X Register:
Quick Input keys have the following functions.
F1 key = X register * 1 Thousand
F2 key = X register * 1 Hundred Thousand
F3 key = X register * 1 Million
F4 key = X register Feet to Inches (X register * 12)
F5 key = X register Inches to Feet ( X register / 12)