hp22a

Model:	-22A

General:
	Name:			none
	Code-Name:		Turnip
	Family:			Woodstock
	Logic:			RPN
	Features:		business, TVM4 [see -70A]
	Firsts:			none
	Introduction:
		Date:		1975-9-1
		Price:		$165
	Discontinuation:
		Date:		1978-05-01
		Price:		$125 (on 1976-09-13)
	Production-Run:		?

Display:
	Type:			LED, 7 segment
	Size:			1 line x 12 chars
	Number-Formats:		sign, 10 mantissa
				sign, 8 mantissa, ., exp sign, 2 exp
	Annunciators:		....... .......	battery low
				(true decimal point is not lit)
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
	Flags:			none
	Register-Usage:		R5	\GSxy
				R6	\GSy
				R7	\GSn
				R8	\GSx^2
				R9	\GSx
				R7 is used by ACC
				R8,R9 used when solving for i
	Numbered-Registers:	10
	Program-Steps:		none
	Program-Editing:	none
	Program-Display:	none
	User-RAM-Bytes:		133
	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:		custom nickel-cadmium cells, AC
	Continuous-Memory:	none
	Expansion-Ports:	none
	I/O-Ports:		none
	Clock:			none

	Length:			?
	Width:			?
	Height:			?
	Weight:			?
	Temperature-Range:
		Operating:	0 to 45 deg C
		Charging:	15 to 40 deg C
		Storage:	-40 to 55 deg C

Keyboard:
	Switches:		OFF / ON
				BEGIN / END
	Shift-Keys:		gold, gold, above
	User-Defined-Keys:	none

Key-Arrangement::

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

Key-Labels-Base-Keyboard::

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

Key-Labels-gold-gold-above::

12x	12\:-	ACC	INT	BAL
L.R.	y^	x-	s	[]
RESET	%\GS	\GD%	CLEAR
ln	[]	[]	[]
 x
e	[]	[]	[]
 x
y	[]	[]	[]
\v/x	[]	[]	\GS-

Programmable-Operations::

none

Non-Programmable-Operations::

%		percent
%\GS		percent of total
+		addition
-		subtraction
shift .		SCI display
0-9, .		enter digit or decimal point
shift 0-9	FIX n display
12x		multiply by 12 and store in n
12\:-		divide by 12 and store in i
ACC		compute accumulated interest
BAL		compute remaining balance
CHS		change sign
CLEAR		clear stack
CLx		clear X
ENTER^		enter
e^x		natural exponentiation
FV		future value, store and solve for
gold		shift
i		interest, store and solve for
INT		simple interest, store and solve for
L.R.		calculate linear regression
ln		natural logarithm
n		number of periods, store and solve for
PMT		payment, store and solve for
PV		present value, store and solve for
RCL 0-9		recall from register
RESET		clear financial and statistics registers
Rv		roll the stack down
s		calculate standard deviation
STO +,-,x,\:- 0-9	storage arithmetic
STO 0-9		store in register
x		multiplication
x-		calculate mean
x<>y		exchange x and y
y^		estimate y
y^x		power
\:-		division
\GD%		delta percent
\GS+		add to statistics
\GS-		subtract from statistics
\v/x		square root

Menus::

none

Bugs/ROM-Versions::

none

Notes::

none