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Section 13: Indirect Operations 198
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FS?
g nn
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FC?
g nn
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FS?C
g nn
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FC?C
g nn
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X<>
g nn
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CATALOG
g nn
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To use an indirect address with a function, first store the desired register
address number (the indirect address) in the register you are using for
indirect control. Then execute the function and press
g and specify the indirect
address. When you press
g , the HP-41C prompts you
for the indirect address. Indirect addressing will become more clear as you read on
in this section.
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You can indirectly address any of the primary storage registers or extended
storage registers (if your HP-41C has been extended with additional memory modules)
currently allocated in the HP-41C. Remember, you can allocate up to 64 primary
storage registers on your basic HP-41C. When you extend the HP-41C memory with
plug-in-memory modules, the storage register capacity of the calculator is increased.
All extended registers (R(100) through
R(318)) require the use of indirect
addressing.
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If the indirect or direct register address is outside the limits of the current
allocation or the number of registers in the HP-41C, the display will show
NONEXISTENT. In all cases only the
absolute value of the integer portion of the register address is used by the
calculator.
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Indirect Store and Recall
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To store and recall numbers indirectly using any of the primary or extended storage
registers, simply press STO or RCL ,
g , and specify the indirect
address. By changing the register address number, you can change the address specified
by the function.
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You can easily demonstrate how indirect store and recall work by using the HP-41C
manually. For example, to store the number 2.54 into R10
using R02 as an indirect address register:
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