hp21a

Model:	-21A

General:
	Name:			Scientific Pocket Calculator
	Code-Name:		Pumpkin (Woodstock)
	Family:			Woodstock
	Logic:			RPN
	Features:		scientific
	Firsts:			Woodstock
	Introduction:
		Date:		1975-2-1
		Price:		$125
	Discontinuation:
		Date:		1978-05-01
		Price:		$80
	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, M
	Flags:			none
	Register-Usage:		none
	Numbered-Registers:	none
	Program-Steps:		none
	Program-Editing:	none
	Program-Display:	none
	User-RAM-Bytes:		35
	Total-RAM-Bytes:	?
	ROM-Bytes:		?
	Machine-State:		prefix key state
				stack lift enable
				display mode
				registers
				memory
	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
				DEG / RAD
	Shift-Keys:		blue, blue, below
	User-Defined-Keys:	none

Key-Arrangement::

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

Key-Labels-Base-Keyboard::

1/x	SIN	COS	TAN	[]
		 x
x<>y	Rv	e	STO	RCL
ENTER^	CHS	EEX	CLx
-	7	8	9
+	4	5	6
x	1	2	3
\:-	0	.	DSP

Key-Labels-blue-blue-below::

 x	   -1	  -1	   -1
y	SIN	COS	TAN	[]
				  x
->R	->P	LN	LOG	10
[]	\v/x	\pi	CLR
M-	[]	[]	[]
M+	[]	[]	[]
Mx	[]	[]	[]
M\:-	[]	[]	[]

Programmable-Operations::

none

Non-Programmable-Operations::

%		percent of
+		addition
-		subtraction
->P		convert rectangular to polar
->R		convert polar to rectangular
0-9, .		enter digit or decimal point
1/x		reciprocal
10^x		common exponentiation
blue		shift
shift blue	clear shift
CHS		change sign
CLR		clear stack
CLx		clear X
COS		cosine
COS-1		arc cosine
DSP . 0-9	fixed decimal mode
DSP 0-9		scientific mode
EEX		start an exponent, 1 not required
ENTER^		enter
e^x		natural exponentiation
LN		natural logarithm
LOG		common logarithm
M+		storage arithmetic
M-		storage arithmetic
Mx		storage arithmetic
M\:-		storage arithmetic
RCL		recall from register
Rv		roll the stack down
SIN		sine
SIN-1		arc sine
STO		store in register
TAN		tangent
TAN-1		arc tangent
x		multiplication
x<>y		exchange x and y
y^x		power
\:-		division
\pi		constant, value 3.141592654
\v/x		square root

Menus::

none

Bugs/ROM-Versions::

none

Notes::

none