hp calculators
HP 12C Platinum Operating modes and clearing procedures
Note that if is flashing in the display and the
PRGM
annunciator is not shown, then an internal function is
being performed and pressing t will not stop it.
Memory Organization
In the HP12C Platinum, memory is organized as a set of registers that can hold a valid number representation. There
are a total of 20 data registers, R
0
to R
9
and R.
0
to R.
9
, that are available for use. There are 309 program lines
available to the user for holding program instructions. If programs are entered that are larger than this, registers are
converted as needed into 8 program lines each, beginning with R.
9
and working down through R
7
, for a maximum of
400 program lines.
Registers R
0
to R
9
and R.
0
to R.
9
are "general purpose" registers, and they can be accessed either directly by the user
or by some internal functions. The shaded area represents the registers that can be automatically converted into
program steps. Although registers R
1
to R
6
are general purpose registers as any other, their contents are used by
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.
n i PV PMT FV
Stack Registers Cash flow N
j
T
R
0
CF
0
N
0
Z
(n)
R
1
CF
1
N
1
Y
(Σx)
R
2
CF
2
N
2
X
Σ (Σx
2
) R
3
CF
3
N
3
(Σy)
R
4
CF
4
N
4
L
(Σy
2
) R
5
CF
5
N
5
(Σxy)
R
6
CF
6
N
6
R
7
CF
7
N
7
R
8
CF
8
N
8
... ... ...
R.
8
CF
18
N
18
R.
9
CF
19
N
19
---
CF
20
N
20
... ... ...
---
CF
28
N
28
---
CF
29
N
29
N
30
...
These program steps are also
available, as you key them in
Permanently available
program steps
Figure 8
hp calculators - 4 - HP 12C Platinum Operating modes and clearing procedures - Version 1.0
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