Section 6: Programming Basics 77
Keystrokes Display
1 ´ m %
1.0000
R
1
and R
0
allocated for data
storage; R
2
to R
97
available for
programming and advanced
functions.
19 ´ m %
19.0000
Original allocation: R
19
(R
.9
)
and below for data storage;
R
20
to R
97
for programming
and advanced functions.
*
l m %
19.0000
Displays the current highest
data register.
The m and W (memory status) functions are described in detail in
Appendix C.
Keep in mind that an error message will result (given the above memory
configuration) if
1. You try to address a register higher than R
19
(R
.9
), which initially is
the highest register allocated to data storage (
Error 3
).
2. You have 546 occupied program bytes and try to load more
program lines (
Error 4
).
3. You try to run an advanced function with insufficient available
memory (
Error 10
).
Program Boundaries
End. Not every program needs to end with a n or ¦ instruction. If
you are at the end of occupied program memory, there is an automatic
n instruction, so you do not need to enter one. This can save you one
line of memory. On the other hand, a program can “end” by simply
transferring execution to another routine using t (Section 7).
Labels. Labels in a program (or subroutine) are markers telling the
calculator where to begin execution. Following an ´ label or G
label instruction, the calculator will search downward in program
memory for the corresponding label. If need be, the search will wrap
around at the end of program memory and continue at line 000. When it
*
For memory allocation and indirect addressing, registers R
.0
through R
.9
are referred to
as R
10
through R
19
.
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