hp70a

Model:	-70A

General:
	Name:			none
	Code-Name:		Scrooge
	Family:			Classic
	Logic:			RPN
	Features:		business, TVM4[see notes]
	Firsts:			dedicated TVM registers
	Introduction:
		Date:		1974-8-1
		Price:		$275
	Discontinuation:
		Date:		1975-10-01
		Price:		$165 (price change 1975-08-01)
	Production-Run:		?

Display:
	Type:			LED, 7 segment
	Size:			1 line x 15 chars
	Number-Formats:		sign, 10 mantissa, ., exp sign, 2 exp
	Annunciators:		...............	battery low
				(true decimal has digit to itself)

Data:
	User-Visible:
		Smallest:	1E-99
		Largest:	9.999999999E99
		Signif.-Digits:	10
	Internal:
		Smallest:	1E-99
		Largest:	9.999999999E99
		Signif.-Digits:	10
	Data-Types-and-Sizes:	real, 7 bytes

Memory:
	Named-Registers:	X, Y, Z, T, n, i, PMT, PV, FV, K, M
	Flags:			none
	Register-Usage:		K is set to 12 on power up
	Numbered-Registers:	none
	Program-Steps:		none
	Program-Editing:	none
	Program-Display:	none
	User-RAM-Bytes:		77
	Total-RAM-Bytes:	?
	ROM-Bytes:		?
	Machine-State:		prefix key state
				stack lift enable
				display mode
				which financial registers set?
				registers
	File-Types:		none

Physical:
	Technology-Used:	?
	Processor:		?
	Chip-Count:		?
	Power-Source:		3 nickel-cadmium AA cells, AC
	Continuous-Memory:	none
	Expansion-Ports:	none
	I/O-Ports:		none
	Clock:			none

	Length:			5.8 in
	Width:			3.2 in
	Height:			0.7 to 1.3 in
	Weight:			9 oz
	Temperature-Range:
		Operating:	0 to 50 deg C
		Charging:	10 to 40 deg C
		Storage:	-40 to 55 deg C

Keyboard:
	Switches:		OFF / ON
	Shift-Keys:		none
	User-Defined-Keys:	none

Key-Arrangement::

** ** ** ** **
** ** ** ** **
** ** ** ** **
***** ** ** **
*  *** *** ***
*  *** *** ***
*  *** *** ***
*  *** *** ***

Key-Labels-Base-Keyboard::

n	i	PMT	PV	FV
			 x
INT	%	\GD%	y	CLR
x<>y	Rv	STO	K	DSP
ENTER^	CHS	M	M+
-	7	8	9
+	4	5	6
x	1	2	3
\:-	0	.	CLx

Programmable-Operations::

none

Non-Programmable-Operations::

%		percent
+		addition
-		subtraction
0-9, .		enter digit or decimal point
CHS		change sign
CLR		clear stack
CLx		clear X
DSP .		set SCI mode
DSP 0-9		set FIX mode, 0-9 places
DSP n,i,PMT,PV,FV	recall value
ENTER^		enter
FV		future value, store and solve for
i		interest, store and solve for
INT		simple interest, store and solve for
K		recall from K
M		recall from M
M+		add X to M
n		number of periods, store and solve for
PMT		payment, store and solve for
PV		present value, store and solve for
Rv		roll the stack down
STO K,M		store in register
x		multiplication
x<>y		exchange x and y
y^x		power
\:-		division
\GD%		delta percent

Menus::

none

Bugs/ROM-Versions::

none

Notes::

TVM4 is the "four value" TVM functions. Combinations:

		input			solve for
	n	i	PMT		FV and/or PV
	n	i	FV		PV and/or PMT
	n	i	PV		FV and/or PMT
	i	PMT	PV		n
	i	PMT	FV		n
	i	PV	FV		n
	n	PV	FV		i
	n	PV	PMT		i
	n	FV	PMT		i

	i	n	PV		INT