HP 12C User Manual page 4

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HP 12C Operating modes and clearing procedures
Memory Organization
In the HP12C, memory is organized as a set of registers that can hold a valid number representation. All memory
available in the HP12C to the user is represented in Figure 8 in terms of registers. Their contents in the figure are their
default contents when memory is cleared or when the calculator is first turned on.
T
Z
Y
X
L
Registers R to R and R.
0 9
or by some internal functions. The shaded area represents the registers that can be automatically converted into
program steps. Although registers R
statistical functions. Financial registers n, ¼, $, P and M are used by TVM, Bond, Depreciation and Cash-
Flow functions, but can also be used to hold any valid number.
How to selectively clear memory contents
The "master clear" of the HP12C is accomplished when the following sequence is executed:
• with the calculator off, press and hold -;
turn the calculator on;
•
release -.
•
hp calculators
n i
Stack
(n)
(Σx)
Σ
(Σx
(Σy)
(Σy
(Σxy) R
Permanently available
program steps
to R. are "general purpose" registers, and they can be accessed either directly by the user
0 9
to R are general purpose registers as any other, their contents are used by
1 6
PV PMT
Registers Cash flow
R CF
0
R CF
1
CF
R
2
CF
) R
2
3
CF
R
4
CF
) R
2
5
CF
6
R CF
7
R CF
8
... ...
R. CF
8
R. CF
9
- 4 - HP 12C Operating modes and clearing procedures - Version 1.0
FV
N
j
N
0 0
N
1 1
N
2 2
N
3 3
N
4 4
N
5 5
N
6 6
N
7 7
N
8 8
...
N
18 18
N
19 19
N
20
Figure 8