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Program Memory Storage Requirements
and LAST X Operations
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Program memory in the HP-41C is structured in registers. Each register can hold
up to seven lines of program instructions. In other words, each register in program
memory is divided into seven parts. One of these parts is called a byte of
program memory.
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Each
register
contains 7
bytes.
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Most operations on the HP-41C require only one byte or program memory for
storage as a line in a program, but some require two or even more bytes. For
your reference, the number of bytes required for storing each programmable
HP-41C function is listed in the table beginning below. The operations are
listed in alphabetical order of their name.
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Note that ALPHA characters require one byte each plus an additional byte
for string when stored in program memory. So the string CIRCLE would
require seven bytes of program memory. Each digit in a number requires
one byte when stored in program memory. The decimal point in a numbers
also requires one byte. The number 28.741 would require six bytes of
program memory.
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Also indicated for each operation is whether the contents of the
X-register are copied into the LAST X register before the operations
is performed.
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Storage
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Requirement
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Saves x
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Function
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(Bytes)
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in LAST X
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ABS
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1
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Yes
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Σ–
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1
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Yes
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Σ+
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1
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Yes
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+
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1
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Yes
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ADV
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1
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No
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