HP12c "c" in display

[tre...@my-deja.com]

Can anyone tell me what the "C" displayed on the HP12c means? I'm sure
it's obvious and I know it's in the manual - but I can't find it or how
to clear it.

Sent via Deja.com http://www.deja.com/
Before you buy.

[Thierry Hautem-Morissette]

Boy, are you lucky! I just bought one last week (to remind me how fun it was
to have a trusty HP calculator from the eighties, the kind who could be
squished by a Sherman tank and come out intact and working).

The C indicates that you are in complex interest mode for the odd period.
Press STO and EEX at the same time to toggle between simple and compound.
See page 59 for more information.
--
Thierry Hautem-Morissette
thmori...@videotron.ca
HP 10A, HP 11C, HP 12C, HP 15C, HP 19B, HP 25C, HP 27S, HP 28C, HP 28S, HP
32E, HP 33E, HP 34E, HP 41C, HP 41CX, HP 42S, HP 48G, HP 95 LX and HP 200LX

<tre...@my-deja.com> a écrit dans le message :
7t1e73$7s7$1...@nnrp1.deja.com...

[Bill Symmes]

To the contrary, the "C" stands for CMOS memory chips -- it was one of the
first calculators with CMOS chips, which extended the battery life a great
deal.

<tre...@my-deja.com> wrote in message news:7t1e73$7s7$1...@nnrp1.deja.com...

[Steve Simpkin]

Actually I believe what tre...@my-deja.com is asking about is the C indicator
symbol on the HP12C display. I had an HP11C and remember it having symbols
such as BEGIN and END which did not relate to any operation on the 11C. I had
assumed that these were used on the HP12C which shared the same hardware
platform. Anyone who is familiar with the HP12C should be able to help with
this question.

The C suffix in HP calculator names first appeared on the HP25C introduced in
1976. This unit featured "Continuous Memory" which saved the contents of
program and register data (but not the Stack) while the unit was off. This
was made possible by the new CMOS memory ICs used on this calculator. I have
never seen mention of whether the C in the model name referred to Continuous
Memory or CMOS.

The C name suffix continued in HP models which featured Continuous Memory
until the introduction of the HP28S in 1988. By this time Continuous Memory
was no longer a novelty and the S which stood for Scientific became the norm.

As a side note, on my sixteenth birthday in 1977, I bought my HP25 at a
calculator store (that's all they sold!) for $120.00 The HP25C was available
for an extra $100.00. I didn't have the additional money at the time and
besides the HP25 only stored 49 program steps. I used that calculator for 10
years though High school, college, and my first job. It still works
perfectly. I only replaced it in 1987 with a HP11C because of limited battery
life (1-2 hours between charges). For comparison the HP11C was still running
on the batteries it came with when I sold it this year (12 years!).

Sincerely,
Steve Simpkin

[Graham Fraser]

> > <tre...@my-deja.com> wrote in message news:7t1e73$7s7$1...@nnrp1.deja.com...
> > > Can anyone tell me what the "C" displayed on the HP12c means? I'm sure
> > > it's obvious and I know it's in the manual - but I can't find it or how
> > > to clear it.
> > >
> > >
> > >
> > > Sent via Deja.com http://www.deja.com/
> > > Before you buy.

The c annunciator in the display is a status indicator that shows the
type of intrest accrual during an odd-period TVM calculation. If the c
annunciator is ON, then compound interest is accrued during the
odd-period.

The c annunciator can be toggled on/off by pressing [STO][EEX]

Refer HP 12C Owner's Handbook pg 59

GrahamF