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Registers
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In this section we will describe the use of the nine addressable storage registers and the manipulating of information
in the stack. Also, to illustrate a use of the stack registers we will present a manual solution to a problem of
compound interest.
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Addressable Registers
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Registers R1, R2, . . . , R9 constitute the addressable registers. Their respective contents
are referred to as r1, r2, . . . r9. Operations refer to them by number. The registers are
typically used to accumulate sums or to store constants or intermediate results. You can store the value of the stack’s
X-register in any addressable register, or you can recall the value in any addressable register to
the X-register. Additionally, you can store in any register an arithmetic sum, difference, product,
or quotient of the contents of the given register and the X-register. For example, if R5
contains 100 and if X contains 70, you can store the difference (100 — 70 = 30) in R5 simply
by pressing  STO – 5.
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Storing and Recalling Data
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To store a number appearing in the display (whether the result of a calculation or keystroke entry):
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1.
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Press STO.
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2.
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Press a number key 1 through 9 to specify in which of the nine registers the number is to be stored.
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If the selected storage register already has a number in it, the old number will be overwritten by the new one.
The value in X will remain unchanged.
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To recall a number previously stored in one of the nine addressable memory registers:
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1.
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Press RCL.
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2.
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Press a number key (1 through 9) to specify which of the nine registers the number is to be
recalled from.
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