hp80a

Model:	-80A

General:
	Name:			Business Pocket Calculator
	Code-Name:		none
	Family:			Classic
	Logic:			RPN
	Features:		-
	Firsts:			business, TVM4, date arithmetic, bond,
				depreciation, shift key, statistics,
				display mode control
	Introduction:
		Date:		1973-2-1
		Price:		$395
	Discontinuation:
		Date:		1978-10-01
		Price:		$295 (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, M
	Flags:			none
	Register-Usage:		none
	Numbered-Registers:	none
	Program-Steps:		none
	Program-Editing:	none
	Program-Display:	none
	User-RAM-Bytes:		70
	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:		gold, yellow, above
	User-Defined-Keys:	none

Key-Arrangement::

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

Key-Labels-Base-Keyboard::

n	i	PMT	PV	FV
		|-COMPUTE-|
[]	%	TL	SOD	DAY
			 x
x<>y	Rv	STO	y	x-
SAVE^	RCL	CHS	CLx
-	7	8	9
+	4	5	6
x	1	2	3
\:-	0	.	\GS+

gold, yellow, above

[]	YTM	INTR	BOND	[]
[]	\GD%	[]	[]	DATE
[]	[]	[]	\v/x	->\GS
[]	[]	[]	CLEAR
[]	[]	[]	[]
[]	[]	[]	[]
[]	[]	[]	[]
[]	[]	[]	\GS-

Key-Labels-f-gold-above::

?

Programmable-Operations::

none

Non-Programmable-Operations::

%		percent
+		addition
-		subtraction
->\GS		"undoes x-"
0-9, .		enter digit or decimal point
shift 0-6	set FIX mode, 0-7 places
shift 7-9	set SCI mode
BOND		calculate bond price
CHS		change sign
CLEAR		clear stack
CLx		clear X
DATE		calculate future or past date
DAY		calculate days between dates
FV		future value, store and solve for
i		interest, store and solve for
INTR		calculate bond interest
n		number of periods, store and solve for
PMT		payment, store and solve for
PV		present value, store and solve for
RCL		recall from register
Rv		roll the stack down
SAVE^		enter
SOD		figure next sum-of-years-digits depreciation
shift SOD	figure first sum-of-years-digits depreciation
STO		store in register
TL		increment n; n -> X; ???
shift TL	compute Y intercept; then # n TL shows predicted Y
x		multiplication
x-		puts mean in X, std dev in Y, n in Z
x<>y		exchange x and y
YTM		calculate bond yield to maturity
y^x		power
\:-		division
\GD%		delta percent
\GS+		summation: sum to X, sum X^2 to Y, n to Z
\GS-		summation -, assumes sum to X, sum X^2 to Y, n to Z
\v/x		square root

Menus::

none

Bugs/ROM-Versions::

none

Notes::

Calls ENTER "SAVE".