Appendix C: Memory Allocation 217
When converting registers, note that:
You can convert registers from the common pool only if they are
uncommitted. If, for example, you try to convert registers which
contain program instructions, you will get an
Error 10
(insufficient
memory).
You can convert occupied registers from the data storage pool,
causing a loss of stored data. An
Error 3
results if you try to address
a “lost”—that is, nonexistent—register. Therefore, it is
good
practice to store data in the lowest-numbered registers first, as
these are the last to be converted.
Program Memory
As mentioned before, each register consists of seven bytes of memory.
Program instructions use one or two bytes of memory. Most program
lines use one byte; those using two bytes are listed on page 218.
The maximum programming capacity of the HP 15c is 672 program bytes
(96 convertible registers at seven bytes per register). At power-up,
memory can hold up to 546 program bytes (78 allocated registers at
seven bytes per register).
Automatic Program Memory Reallocation
Within the common register pool, program memory will automatically
expand as needed. One uncommitted register at a time, starting with the
highest-numbered register available, will be allocated to seven bytes of
program memory.
Conversion of Uncommitted Registers to Program Memory
Program Bytes
R
97
1 to 7
R
96
8 to 14
R
95
15 to 21
R
21
533 to 539
R
20
540 to 546
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