hp27a

Model:	-27A

General:
	Name:			none
	Code-Name:		Salad
	Family:			Woodstock
	Logic:			RPN
	Features:		scientific, business, statistics
	Firsts:			"do everything" (scientific, statistical,
				business), normal distribution,
				heavy statistics
	Introduction:
		Date:		1976-5-1
		Price:		$200
	Discontinuation:
		Date:		1978-05-01
		Price:		$175 (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, Last x, n, i, PMT, PV, FV
	Flags:			none
	Register-Usage:		R4	\GSn
				R5	\GSx
				R6	\GSx^2
				R7	\GSy
				R8	\GSy^2
				R9	\GSxy
	Numbered-Registers:	10
	Program-Steps:		none
	Program-Editing:	none
	Program-Display:	none
	User-RAM-Bytes:		140
	Total-RAM-Bytes:	?
	ROM-Bytes:		?
	Machine-State:		prefix key state
				stack lift enable
				display mode
				which financial registers set?
				degrees / rad/ grad
				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
	Shift-Keys:		f, gold, above
				g, black, below
	User-Defined-Keys:	none

Key-Arrangement::

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

Key-Labels-Base-Keyboard::

y^	x-	%	f	g
				 x
x<>y	Rv	STO	RCL	y
ENTER^	CHS	EEX	CLx
-	7	8	9
+	4	5	6
x	1	2	3
\:-	0	.	\GS+

Key-Labels-f-gold-above::

FIX	SCI	ENG	[]	[]
n	i	PMT	PV	FV
|--------- CLEAR ---------|
PREFIX	\GS	REG	STK
[]	ln	log	->R
[]	sin	cos	tan
[]	H.MS+	\v/x	n!
[]	->H.MS	LASTx	\GS-

Key-Labels-g-black-below::

L.R.	s	\GD%	[]	[]
r	VAR	N.D.	NPV	IRR
RESET	DEG	RAD	GRD
	 x	  x
[]	e	10	->P
	   -1	   -1	   -1
[]	sin	cos	tan
		 2
[]	H.MS-	x	1/x
[]	->H	\pi	%\GS

Programmable-Operations::

none

Non-Programmable-Operations::

%		percent
%\GS		percent of total
+		addition
-		subtraction
->H		conver to decimal hours
->H.MS		conver to HH.MMSS
->P		convert rectangular to polar
->R		convert polar to rectangular
0-9, .		enter digit or decimal point
1/x		reciprocal
10^x		common exponentiation
CHS		change sign
CLx		clear X
cos		cosine
cos-1		arc cosine
DEG		degrees mode
EEX		start an exponent, 1 not required
ENG 0-7		ENG display
ENTER^		enter
e^x		natural exponentiation
f		shift
FIX 0-9		FIX n display
FV		future value, store and solve for
g		shift
GRD		grads mode
H.MS+		hms addition
H.MS-		hms subtraction
i		interest, store and solve for
INT		simple interest, store and solve for
IRR		calculate internal rate of return
L.R.		calculate linear regression
LASTx		recall last x
ln		natural logarithm
log		common logarithm
n		number of periods, store and solve for
n!		factorial
N.D.		calculate normal distribution parameters
NPV		calculate net present value
PMT		payment, store and solve for
PREFIX		clear prefix key
PV		present value, store and solve for
r		compute correlation coefficient
RAD		radians mode
RCL +,-,x,\:- 0-9	recall arithmetic
RCL 0-9		recall from register
REG		clear storage registers
RESET		clear financial status indicators
Rv		roll the stack down
s		calculate standard deviation
SCI 0-7		SCI display
sin		sine
sin-1		arc sine
STK		clear stack
STO +,-,x,\:- 0-9	storage arithmetic
STO 0-9		store in register
tan		tangent
tan-1		arc tangent
VAR		compute variance
x		multiplication
x-		calculate mean
x<>y		exchange x and y
x^2		square
y^		estimate y
y^x		power
\:-		division
\GD%		delta percent
\GS		clear summation registers
\GS+		add to statistics
\GS-		subtract from statistics
\pi		constant, value 3.141592654
\v/x		square root

Menus::

none

Bugs/ROM-Versions::

none

Notes::

The "do everything" Pioneer: math, statistics, finance.