hp12cpt

Model:	12CPt, differences from -12C

General:
	Name:			Platinum
	Code-Name:		Bondi

	Introduction:
		Date:		2003-05-?
		Price:		$105

Display:
	Annunciators:		battery symbol	battery low
				f	f-shift
				BEGIN	begin/end mode
				D.MY	date format
				C	compound interest
				PRGM	program mode
				ALG	ALG mode
				RPN	RPN mode

Memory:
	Numbered-Registers:	20 -> 7 (still)
	Program-Steps:		0 -> 392
	User-RAM-Bytes:		203
	Total-RAM-Bytes:	281
	ROM-Bytes:		7808
	Machine-State:		prefix key state
				stack lift enable
				display mode
				program counter
				three level return stack
				radix mark
				PRGM mode
				program / register memory divider
				BEGIN/END mode
				D.MY / M.DY mode
				compound interest mode
				registers
				memory
				algebraic / RPN mode

Physical:
	Power-Source:		2 x CR2032

	Weight:			?
	Temperature-Range:
		Operating:	?
		Charging:	none
		Storage:	?

Key-Labels-f-gold-above::

AMORT	INT	NPV	RND	IRR	RPN	[]	[]	[]	[]
|--BOND---|	|--DEPRECIATION--|
PRICE	YTM	SL	SOYD	DB	ALG	[]	[]	[]	[]
	|-------------- CLEAR ---------------|
P/R	\GS	PRGM	FIN	REG	PREFIX	[]	[]	[]	[]
OFF	[]	[]	[]	[]	PREFIX	[]	[]	[]	[]

Key-Labels-g-blue-below::

12x	12\:-	CFo	CFj	Nj	DATE	BEG	END	MEM	[]
	 x								 2
\v/x	e	LN	FRAC	INTG	\GDDAYS	D.MY	M.DY	x-.w	x
PSE	BST	GTO	x\<=y	x=0	=	x^,r	y^,r	n!	[]
[]	[]	[]	[]	[]	=	x-	s	\GS-	LSTx

Programmable-Operations (new)::

x^2		square
=		for use in algebraic
ALG		ALG mode
GTO 0-392	go to program step (range change)
RPN		RPN mode

Non-Programmable-Operations::

ON + PMT	reset calculator DELETED: there's now a small hole
		near the battery

Bugs/ROM-Versions::

Pressing f CLEAR-PRGM in run mode no longer resets the current program
line to 000.

Programs written in ALG mode can be run in RPN mode without warning
and vice versa.

Discovered by Tony Hutchins and Jordi Hidalgo:

When program memory consists of at least 260 lines, the instructins
GTO n-255 through GTO 255 cause an Error 4, n being the last allocated
line: 260, 267, ... 393, 400 (but not 399).

In the Fall of 2005, they started producing models with parentheses
keys.  There was no change in model number.

Notes::

(Much of the following by Jordi Hidalgo. Datafile V22N3p8-11)

Algebraic mode has no precedence.  It also has no parentheses.  On the
other hand, RPN stack operations work in this mode.

Registers don't start getting converted to program memory until after
step 310.

There are also 10 new cash flow registers, CF21 through CF30.  They are
converted to program memory for steps 240 through 309.

Storage register arithmetic is still only possible with registers 0 to
4.

The source code to the 12 software was lost and this is a
reimplementation.  Some things are faster, some are slower, and
accuracy is sometimes less.

For example, f CLAR-FIN n=10 PV=100 PMT=-20 solve for i takes 15
seconds on the -12C but 40 seconds on the 12CPt.  Re-solving for i
takes 4 seconds on the -12C but still 40 seconds on the 12CPt

Manufactured by Kinpo Electronics.

Tony Hutchins reports that LSTx in ALG mode works in this way:

- LSTx LSTx leaves the stack unchanged.

- L is only refreshed when a new calculation begins with a digit.

A change in the keyboard was made in late 2005 to add parenthses keys.
The early (non-parentheses version) also had a very poor solver: both
keys and solver were fixed.  The newer version had backspace and undo
keys.

25th Anniversary edition, the 12CPA, to be released in mid- to
late-2006.

A version called the HP12c Prestige was released in Brazil (and
possibly other parts of South America) only on or around
2006-04-16. The bezel was gold and it said "Prestige" instead of
"Platinum." This was the updated version of the 12cpt, with
parentheses.

The "gold" shift was orange.