Model:	-01A

	Name:			Wrist Instrument
	Code-Name:		Cricket
	Family:			none
	Logic:			algebraic
	Features:		-
	Firsts:			algebraic, 4 function, watch, only
				HP calc w/o exponential notation entry
		Date:		1978-7-1
		Price:		$650 steel case
				$850 gold tone case
		Date:		1980-01-01
		Price:		$695 steel case
				? gold tone case
	Production-Run:		?

	Type:			LED, 7 segment
	Size:			8 digits
	Number-Formats:		Number: sign, 1-8 digits, "."
					sign, 1 digit, ".",
						3 digits, sign, 2 digits
					(sign is "-" or space)
				Date:   "DY-MO-YR"	(20th cent.)
					"DY-MO-YR."	(21st cent.)

				Time:   "HH:MM:SS.AP"
					(AP is am or pm, if active)
				Timer:	"MM:SS.HH"
					(HH is 1/100sec)
	Annunciators:		none

		Smallest:	.00000001
		Largest:	99999999
		Signif.-Digits:	8
		Smallest:	1E-99
		Largest:	9.999E99
		Signif.-Digits:	8
				You can't enter exponential values, but
				the watch displays results >= 1E7 or
				< 1E-4 in scientific form.

				Time entry range is from 00:00:01 to
				99999:59 (no sec).

				Date entry range is from 1 Jan 1900
				to 31 Dec 2099.

	Data-Types-and-Sizes:	number
				date MM/DD/YY (or MM/DD/YY),
					w/21st cent indicator
				time HH:MM:SS.hh w/am/pm indicator
	Named-Registers:	M, D, S, T, A, display
	Flags:			see state
	Register-Usage:		none
	Numbered-Registers:	0
	Program-Steps:		0
	Program-Editing:	none
	Program-Display:	none
	User-RAM-Bytes:		6
	Total-RAM-Bytes:	30.5
	ROM-Bytes:		2048 10-bit words on two chips,
				2560 bytes total
	Machine-State:		operating mode
				pending op
				is constant?
				date mode
				time mode
				alarm time
				alarm on/off
				stopwatch time
	File-Types:		none

	Technology-Used:	CMOS
	Processor:		48-bit, similar to -35As but with sleep mode
	Chip-Count:		6, equivalent to 38,000 transistors
	Power-Source:		3 357 cells; two for the display and
				one for the watch; changing the
				display cells does not cause time/
				memory loss
	Continuous-Memory:	sort of
	Expansion-Ports:	none
	I/O-Ports:		piezo speaker
	Clock:			yes

	Length:			?
	Width:			?
	Height:			?
	Weight:			170 g
		Operating:	0 to 55 deg C (note that since it it worn
				on a wrist, watch temperature will remain
				close to body temperature even in very
				cold weather
		Charging:	N/A
		Storage:	-40 to 75 deg C (no batteries)
				-40 to 55 deg C (with batteries)

	Switches:		none
	Shift-Keys:		^, ?, above
	User-Defined-Keys:	none


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


R	0	1	2	3	4	S
.	5	6	7	8	9	C
:	+	-	x	\-:	=	p
D	/	A	^	M	%	T

Note that the R, S, D, A, M and T keys can be pressed with a finger.
All others require use of the stylus.  R and S are depressed slighly to
prevent accidental presses.


[]	[]	[]	[]	[]	[]	[]
[]	[]	[]	[]	[]	[]	[]
DW	21	-/+	<-->	T>	>T	a
[]	[]	[]	[]	[]	[]	[]




%	percentage
+	addition: in date mode, does calendar arithmetic; in time mode
	does time arithmetic
-	subtraction: in date mode, does calendar arithmetic; in time mode
	does time arithmetic
-/+	change sign
/	separate date fields
^ /	compute day of year
0-9	enter digit
.	enter decimal point; also separates seconds from 1/100 seconds
21	specify a date in the 21st century
:	separate time fields
<-->	exchange first and second numbers
=	complete calculation
>T	convert HMS to decimal hours
a	indicate am time
A	alarm function; show alarm time
^ A	store number into A as alarm time
A ^ A	reset/disable alarm
C	clear last entry
C C	clear the calculator
D	date function (mode)
^ D	store number into D as date
D ^ .	toggle MM/DD/YY and DD/MM/YY
DW	compute day of the week
M	recall memory
^ M	store into M; in stopwatch mode and watch running, takes
p	indicate pm time
R	reads (turns on) display; in stopwatch mode and watch stopped,
	resets stopwatch; in stopwatch mode and watch running, takes
S	timer/stopwatch function; also starts watch
^ S	store number into S as stopwatch time
S =	returns to dynamic calculation
T	time (watch) function; show time; in stopwatch mode and watch
	running, inhibits stopwatch display but leaves watch running
^ T	store number into T as time (number as HH:MM:SS)
T ^ .	toggle am/pm and 24 hour mode
T>	convert decimal hours to HMS
x	multiplication
^	shift
\-:	division




From Ken Sumrall, HP Cupertino Systems Lab, ken@cup.hp.com in Jan 1996:

As for bugs, there are two that were discovered after the watch was
released.  I discovered one myself, and I tracked down the person who
wrote the HP-01 firmware (he still works for HP) and asked him if
there are any more.  Here is my original question and his reply:

> BTW, were there any bugs in the released watch?  I think I recall playing
> with it when I got it, and found it was not possible to enter the date
> Feb. 29, 2000 from the keyboard, but all date calculations did work correctly,
> and Feb. 29, 2000 would be displayed if you added 1 day to Feb. 28, 2000.

Here again, I am really straining.  I seem to recall only two bugs
were discovered after we released the product.  The leap year day 2000
that you pointed out was one of them.  The other one was more obscure,
but also a bit more serious.  You may or may not know that one of the
little features of the watch was that you could multiply or divide the
running stopwatch by a number and see the result (stopwatch
interpretted as a decimal number of hours) updated in the display once
a second.  Handy to watch your long-distance charges mount up in real
time, for example...  Unfortunately, if you foolishly decide to divide
the running stopwatch by zero, you do not get a neat clean flashing
display error so you can fix the problem.  The watch locks up and the
code goes off to never, never land.  It requires a hard reset or
battery removal to recover in a reasonable amount of time :(


HP's only watch.

There was a "Macys" branded version.

Composite operations:

	X op Y = (op = +,-,x,\-:)
	X op Y =, then Z =, etc. (op = +,-,x,\-:)
	X op Y % = does net amount (op = +,-)
	X x Y % = does percentage
	X \-: Y % = does percent
	X op Y ^ T does adjust clock (op = +,-)
	S op X = does hourly rate math (op = x,\-:)

Although not intended for underwater use, it had been designed to
withstand immersion to 10 m for 5 min at 25 deg C.

Will operate in magnetic fields to 60 gauss.

Jeremy Smith's price list also shows:

model	introduced	at	price changed	to	discountinued
-02A	1977-07-01	$750	1978-07-01	$850	1980-01-01
-03A	1977-12-01	$750	1978-07-01	$850	1980-01-01
-04A	1978-06-01	$650				1980-01-01
-05A	1978-06-01	$775				1980-01-01
-06A	1978-06-01	$775				1980-01-01
-07A	1978-06-01	$695				1980-01-01

Don't know what the models represent.

The Wall of Fame lists a 1978-07-01 introduction date.  This is believed
to be wrong, but it's hard to argue with.

Newsgroups: comp.sys.hp48
From: frank@arcglade.demon.co.uk (Frank Wales)
Subject: Re: Please tell me of the HP 01 calculator/watch. 
Date: Sat, 2 Oct 1993 23:24:13 +0000
Message-ID: <749618071snz@arcglade.demon.co.uk>

>In article <28dmn1$63f@shasta.wwc.edu> frohro@wwc.edu (Rob Frohne) writes:
>>I just was reading the HP Journal issue on the 48SX and noticed
>>that HP made a model HP 01 calculator watch.  ... Does an RPN 
>>calculator watch really exist?

I think National Semiconductor showed an RPN scientific calculator watch in
the late 70s, but I'm not sure it ever came to market.  The HP-01 uses
the Other System, with percentages, automatic constant and a memory.

In article <z6$@byu.edu> RHELPS@caedm.et.byu.edu writes:
>...The big problem with all those LED watches was power consumption of 
>course, so they all had buttons you had to push to see the time.  
>They were never very popular.

The LED watch market, such as it was (and they did sell), was killed stone
dead when watches with LCDs appeared.

>The HP01 was BIG.  As I remember about 1/2 inch thick.  It appeared to be 
>gold or gold plated and came with this "free" slimline pen.  

1/2 inch thick is about right.  It contained three batteries, one for
the timekeeping functions and two to power the display.  Gold or steel 
finishes were available.

>The back of the pen was just the right size to push the tiny buttons.  

Four of the buttons are pushable with a fingernail (to display the time,
date, alarm or stopwatch/timer).  The rest need a stylus; there is a
stylus built into the clasp, in addition to the pen one.

>I don't think it was a very impressive calculator.  It just had 4 basic 
>functions I think.  

However, it is the only calculator watch I know of that properly integrated 
the functions of the unit (the calculator had access to the calendar for 
work with times and dates, and the stopwatch could use the calculator to
update the display in non-second intervals [the manual provides the example 
of watching the actual cost of a phone call in cents ticking over in the 
display]).  Much better than just having a calculator and a timepiece with 
no relationship beyond being implemented in one case.

>It was also very expensive.  Hundreds of dollars.

It still is.  You try buying one today.  [HP-01s gratefully received.]
Frank Wales, ArcGlade Services Ltd, Kingston, UK [frank@arcglade.demon.co.uk]



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Last modified Saturday, 2012-02-25T17:29:15-06:00.