HDTenEightyP/NetNews huggingface dataset:
From: pshuprs@prism.gatech.EDU (Howlin' Bob)
Newsgroups: comp.sys.hp48
Subject: Re: More powerful transmitter?
Date: 9 Oct 92 19:58:41 GMT
Organization: Georgia Institute of Technology

I wonder if he was taking the port cover off?
It's very important not to do this, as the IR will echo very badly.

Robert


-- 
Robert Sanders 
Georgia Institute of Technology
uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!pshuprs
Internet: pshuprs@prism.gatech.edu     OR  gt8134b@prism.gatech.edu
From: detlef@dmhh.hanse.de (Detlef Mueller)
Newsgroups: comp.sys.hp48
Subject: Re: System RPL Questions
Distribution: world
Date: Wed, 07 Oct 92 12:42:14 GMT
Organization: Who is Organized ?

kskalb@immd1.informatik.uni-erlangen.de writes in article <Bvp6oI.B75@immd4.informatik.uni-erlangen.de>:
> 
> mheiskan@hut.fi (Mika Heiskanen) writes:
> 
> >>>5) I don't understand what the 'TakeOver' does in the parameterised
> >>>outer loop.
> 
> >>I'm not sure either what TakeOver does in those objects that will never
> >>appear in menus, but I keep on including them. I assume that they
> >>are there prophylacticaly.
> 
> >Internally key presses are handled by DoKeyOb. If pressing a key leads to
> >executing a secondary, DoKeyOb checks that the first command is TakeOver.
> >If not, pressing the key gives an error beep. Else the program is executed
> >(TakeOver is a null secondary). Thus TakeOver is an identifier for valid
> >programs to execute by a key press.
> 
> Ok, you might be right, but I once removed a TakeOver in a key definition
> in ParOuterLoop and noticed no difference in the behaviour of the key while
> that POL was active. Maybe I don't remind that correctly, but
> I still doubt that the TakeOver does something in the key definitions for
> a ParOuterLoop. I know I should clear this up by trying it, but right
> now I dont have the time. Any takers ?
> 
> -KK

TakeOver signals the POL to execute a KeyOb without leaving an active
command line; eg. if you set up the CST entry

	{ $ "TST" :: %25 InitMenu% ; }

pressing CST TST during an active command line causes an error or leaving the
command line (depends on the entry mode); if you change the CST entry to

	{ $ "TST" :: TakeOver %25 InitMenu% ; }

pressing TST brings up the port 0 menu without leaving the command line.

Hope that helps,
	8-Detlef
--
+------------------------------------+--------------------------------------+
|`What a depressingly stupid machine'|             Detlef Mueller           |
| -- Marvin                          |          detlef@dmhh.hanse.de        |
+------------------------------------+--------------------------------------+
From: jgauvin@ncr-mpd.FtCollins.NCR.COM (jgauvin)
Newsgroups: comp.sys.hp48
Subject: Re: Serial Number determination
Date: 12 Oct 92 14:46:19 GMT
Organization: NCR Microelectronic Products Division

<1992Oct7.115943.3875@engage.pko.dec.com> <1avrmeINNdgc@matt.ksu.ksu.edu>
Reply-To: jgauvin@ncr-mpd.FtCollins.NCR.COM ()
Followup-To: 
Distribution: 
Organization: NCR Microelectronic Products Division
Keywords: 

In article <1avrmeINNdgc@matt.ksu.ksu.edu> windsor@matt.ksu.ksu.edu (Rob
Windsor) writes:
>ervin@pinbot.enet.dec.com (Joseph James Ervin) writes:
>
>>The TICKS command returns a 13 nibble binary integer which represents the
>>number of 8192 Hz clock ticks since the birth of Christ.  If you take
>>the number returned by the ticks command and divide by 8192, you get the
>>number of seconds since the birth of Christ......
>
>OK, Lets see how off my '48 is here...
>
>I ENTER:       TICKS<enter>           I GET:   1:    # 515159665195974d

<< stuf deleted >>

>
>>............................................................by 365 to get
>>years....and so on.
>
>ME:   365</>                          CALC:    1:    # 1994d
>
>Uhm, somebody?  Did I sleep or something?
>
>The date across the top says "10/07/92".  What gives?

Yes, you did fall asleep! There are 365.25 days per year, thus the whole leap
year concept.

-- 
Jeff Gauvin, Applications Engineer - Graphics Products
NCR Corp., Microelectronic Products Division
1635 Aeroplaza Drive, Colorado Springs, CO 80916
Voice: 719-596-5795, x380    FAX: 719-597-8225
Newsgroups: comp.sys.hp48
From: jhawk@panix.com (John Hawkinson)
Subject: Card carrying cases?
Date: Thu, 8 Oct 1992 02:00:46 GMT
Organization: PANIX Public Access Unix, NYC

Does anyone know if there are any carrying cases available for
hp48s expansion cards? Perhaps along the lines of those collapsable
3.5" disk cases?

Thanks in advance.

--
John Hawkinson
jhawk@panix.com
From: dunguyen@ecs.umass.edu
Newsgroups: comp.sys.hp48
Subject: speeding up the 48SX
Date: 7 Oct 92 21:34:49 GMT

Hi all,
Why is the graphing on the hp48 so sloowww?  It's not just graphing
alone, it's also takes much too long to perform calculations.  My
friends who have the Casio and the TIs ran rings around me when it
comes to graphics and just plain calculations.  I know the speed of
the calculator is only 2 Mhz, but can we change the internal
crystal like what being done like what people did on the IBM AT
crystal like what people did with the IBM AT to speed it up by
changing the clock crystal?

Also, with the cost of the HP cable being around $30.00 or so, can
anyone build an IR interface that would connect into the serial
port of the PC?  It would be much more convenient to aim at the
interface and transfer rather than plug and unplug the 48SX.  If I
know how to do it, I would.  Maybe, some of you can commercial this
idea.  It's for the common goods...
Newsgroups: comp.sys.hp48
From: tp923021@jarrah.canberra.edu.au (Ben Elliston)
Subject: More powerful transmitter?
Organization: Info Sci & Eng, University of Canberra, AUSTRALIA
Date:  8 Oct 92 10:18:46 GMT

I noticed that two HP-48sx's require that for infrared file transfers,
etc., the transmit and receive 'bulbs' need to be _touching_ to be able
to transfer reliably.

Is there a way that a small "amplifier" or something could be built to
strengthen the signal enough for transfers up to about 10 metres or so?

Using UHF, perhaps?  The device could then just be built to slip over
the top of the case and over the infrared LED.

Finally, are there any real-time conversation "terminal" programs for
the 48sx for chatting using the transmitter/reciver?

Thanks.

Cheers,
%Ben%
------------------------------------------------------------------------------
Ben Elliston                                           | This message
Bachelor of Engineering (Computer Engineering)         | brought to you
University of Canberra                                 | by the machine
Internet: tp923021@fir.canberra.edu.au                 | that goes
FidoNet:  3:620/262                                    | 'ping'!
-------------------------------------------------------+----------------------
Some people make champagne out of water.
------------------------------------------------------------------------------

Newsgroups: comp.sys.hp48
From: fokp@bray1b.its.rpi.edu (Ben Fok the "lemming")
Subject: schip file?
Keywords: schip file
Reply-To: fokp@rpi.edu
Organization: Rensselaer Polytechnic Institute, Troy, NY.
Date: Fri, 16 Oct 1992 21:49:50 GMT

Does anyone know where I can find a schip file on the ftp?
Thanks
Ben
fokp@rpi.edu


From: rrd@hpfcso.FC.HP.COM (Ray Depew)
Date: Tue, 6 Oct 1992 15:15:20 GMT
Subject: Re: HP48S graphics
Organization: Hewlett-Packard, Fort Collins, CO, USA
From: kskalb@immd1.informatik.uni-erlangen.de (Klaus Kalb)
Subject: Re: Running Prgs from other directory
Organization: CSD., University of Erlangen
Date: Thu, 8 Oct 1992 11:59:45 GMT

akcs.joehorn@hpcvbbs.cv.hp.com (Joseph K. Horn) writes:

>kskalb@immd1.informatik.uni-erlangen.de [Klaus Kalb] writes:

>> If the program calls subprograms, nothing helps except including it
>> into a lib or keeping it and its subprograms in the path.
>> Transforming the calls to subprograms into something like { HOME FOO
>> BAR } RCL EVAL is clumsy and won't work in all situations.

>Won't

>   { HOME FOO BAR } PATH + EVAL

>always work?  It runs BAR in the FOO directory, and then returns
>automatically to whatever was the current directory beforehand.

>This lovely method was posted by David J. Fred (djf@css.itd.umich.edu)
>on January 15th, 1992, and is on Goodies Disk #7 as "FULLPATH.DOC".

OK. Lets clear up the things:

There are two conditions we need to take care of if we want to run a
program that is not in the path:  

(1) The program might call subroutines that are not in the path 
(2) The program does something with the current dir (recalling vars,
    sorting the dir, ...)

If (2) is not true, David Fred's neat trick does it.
If (1) is not true, { HOME FOO BAR } RCL EVAL does it. 

If both conditions are met, the cite from my previous post applies.
My error was to assume (2) without realizing that I did.

My suggestion to resolve this worst case (without USRLIB magic)
is to replace all calls to the subroutine BAR on { HOME FOO } by
{ HOME FOO BAR } RCL EVAL, (this could be done automagically by
a recursive program converter that isn't to hard to write in SysRPL)
but this will fail eg. if the subprogram identifiers appear in
menu lists. That was what I had in mind while writing "won't work
in all situations".

Trying to think logically, -KK

---
------------------------------------------------------------------------------
    Klaus Kalb     | mail :  IMMD1 / Martenstr. 3 / W-8520 Erlangen / Germany 
 Werch ein Illtum  | email:  kskalb@immd1.informatik.uni-erlangen.de   
------------------------------------------------------------------------------
From: fokp@bray1a.its.rpi.edu (Ben Fok the "lemming")
Newsgroups: comp.sys.hp48
Subject: transferring Pacman?
Keywords: Pacman
Date: 16 Oct 92 17:25:00 GMT
Article-I.D.: rpi.c_4z==g
Reply-To: fokp@rpi.edu
Organization: Rensselaer Polytechnic Institute, Troy, NY.

I have transfered the pacman program to my calculator but I didn't work
Then I opened the file and I saw a bunch weird characters, not the original
program.  I wonder if I should transfer the program using binary or ASACii
.  Does anbody have pacman and can you send me a copy? 
Thanks in advance.
Ben Fok
fokp@rpi.edu
Organization: University of Illinois at Chicago
Date: Wednesday, 7 Oct 1992 15:36:09 CDT
From: Viscouse P'pello <U50879@uicvm.uic.edu>
Newsgroups: comp.sys.hp48
Subject: connect

     Perhaps I'm just not cut out for this stuff, but I'm having a dickens of a
 time connecting my hp48 to an IBM.  What commands do I use?  So far, these are
 what I typed in to no avail, inside kermit:
     SET PORT COM1
     SET SPEED 1200
     SET PARITY NONE
     CONNECT

 My hp is set up as wire, 1200, no parity, checksum3, translate code 1.  Is the
re a terminal type I need to emulate on the IBM?  I then hit RECV and wait.  It
 never makes the connection.  Are there any IBM people out there who've done th
is succesfully?  If so, please have your people e-mail my people.  Thanks.




*        THE SNIPER'S GUILD            *  a.k.a.   Namir Gharaibeh      *
* "Proud Advocates of Creative Mayhem" *           U50879@uicvm.uic.edu *
*  Viscouse P'pello                    *                                *
*  Etatech Industries Rep.             *     University of Illinois     *
*  Chicago Branch, XQ Division         *           at Chicago           *
Newsgroups: comp.sys.hp48
From: cloos@theory.TC.Cornell.EDU (James H. Cloos Jr.)
Subject: Re: Serial Number determination
Organization: Cornell Information Technologies, Ithaca, NY 14853
	<1992Oct7.115943.3875@engage.pko.dec.com>
	<1avrmeINNdgc@matt.ksu.ksu.edu> <1992Oct8.053006.21629@netcom.com>
Date: Fri, 9 Oct 1992 06:42:12 GMT

For the notes on taking TICKS and dividing by (8192*3600*24)*DaysPerYear
to get the current year, use the value 365.2425 for days/year.  That is
the exact mean number of days per year over any 400 year stretch, according
to the Gregorian calendar.  (NB  400 years is the period of variation in
the number of days per year in the Gregorian calendar.)

Given that the algorithm that converts TICKS to DATE,TIME considers
dates before the Julian to Grogorian changeover invalid, it seems
evident that the algorithm uses the Gregorian system exclusively.

-JimC

--
James H. Cloos, Jr.		include <std/disclaimers.h>
Cloos@Theory.TC.Cornell.EDU     include <std/qotd>
Cloos@Batcomputer.UUCP 		Phone:  +1 716 866-5249
Cloos@CrnlThry.BITNET 		Snail:  POBox 1111, Amherst, NY 14226-1111
Lines: 19
Date: Sat, 10 Oct 92 06:51:19 MDT
Newsgroups: comp.sys.hp48
Subject: Re: Serial Number determination
Organization: Brigham Young University, Provo UT USA
From: rhelps@bones.et.byu.edu (Richard Helps)

In article <3140@voodoo.UUCP> mnb@voodoo.boeing.com (Mike Burr) writes:
>>All the TICKS command is is the number of 1/8192ths of a second that has
>>elapsed since Midnight, 1 January, "AD 0" (there's no such year, but 
>
>Wait a minute!  If this is true, then my HP must be living in the past...
>I only get # 503623063 from ticks.  That works out to 61477 secs... or about
>17 hrs.  Gee, if my calculator is correct, I can go to Jerusalem and change
>Christs' diapers :^).  What gives here?


>Michael Burr   mnb@voodoo.boeing.com  | Boeing Computer Services, Bellevue WA

This happened to me too.  You forgot the magic incantation. STWS.  Set
your word size to 64 bits and all will be well.
 
Richard Helps, BYU, Provo UTAH



From: akcs.husty@hpcvbbs.cv.hp.com (Ali Persian Momeni)
Date: Sat, 10 Oct 1992 05:40:02 GMT
Subject: Re: wondering about the hp promotion?
Message-ID: <2ad65f72.1882.1comp.sys.hp48.1@hpcvbbs.cv.hp.com>
Newsgroups: comp.sys.hp48

It depends on how your school bought the calculators (or better yet, when
your school bought them).  If the hp48's were purchased with in the time
interval of the offer, then you will find a set of coupons in the box of
your hp48.  In order to get the stuff, like the free PC link, you will
have to fill out the coupon and send it away.

I hope this helps.
ali.    momeni@vu-vlsi.ee.vill.edu
From: cail@ecs.umass.edu (Brian J. Cail)
Newsgroups: comp.sys.hp48
Subject: FTP/TELNET to HP Calculator BBS--HELP!
Date: 9 Oct 92 00:54:35 GMT

Please help me!!!  I'm trying to pull HP48SX files for the HP calculator
board through an Internet connection (via my university's VAX).  I know that
because of the file transfer problems I can't do this via TELNET on the VAX.  
However, is it possible to use FTP to retrieve files?  I tried this but
was unable to access the full range of HP48SX files (ie. 3D Plot).

I am seeking any help in solving this problem.

Thanks in advance,

	Brian Cail
	University of Massachusetts at Amherst
	Cail@ecs.umass.edu

	(direct e-mail responses preferred)  :)
From: Borel@elsrfm.epfl.ch (Borel Philippe)
Newsgroups: comp.sys.hp48
Subject: Copying HP Equation Libraries and others
Date: 12 Oct 92 15:43:49 GMT
Followup-To: comp.sys.hp48
Organization: Ecole Polytechnique Federale de Lausanne

I've tried to copy some libs of the HP Equation Library Card, it worked
well but when I try to get one lib back to my HP48SX and try to install
it, it erases all the other libs and the only way to get them back is to 
recover memory...
I also had this problem with another library named "Switch".

What's that, a bug, an error due to transmission or a protection ?
I use XYModem with VersatermPRO 3.6.2 and SQ X/YModem file transfer tool.

Thank you
From: windsor@chester.ksu.ksu.edu (Rob Windsor)
Newsgroups: comp.sys.hp48
Subject: Re: Help with .zip ... not again!
Date: 14 Oct 1992 23:14:07 -0500
Organization: Kansas State University
Distribution: world
NNTP-Posting-Host: chester.ksu.ksu.edu


>Hi....
>
>I've got the FAQ of how to unzip .zip files, (I have disks full of hornx.zip
>from seq) I've tried PKUNZIP, which exploded the first 12+ lines of a message
>from chris, then it terminates with an error message; recommends that I use
>PKFIX, but I don't have that...   I've also tried pkz110.exe from seq, but
>it just hangs the PC.  (I did a `I' on the ftp prompt)

It really does sound like you transferred the files using the ASCII format.

Unless your college has remapped some of the keys used in ftp, "I"
doesn't normally do the job.  You'll need to type "binary" to set that.

i.e.
----------- begin session -------------
~>ftp seq.uncwil.edu
Connected to seq.uncwil.edu
< 220- stuff deleted... >
< 331  stuff deleted... >
< 230- stuff deleted... >
230 Guest login ok, access restrictions apply.
ftp> i
?Invalid command
ftp> I
?Invalid command
ftp> binary
200 Type set to I.
ftp> 
------------ end session --------------

I believe that I had a similiar problem earlier like this and it was because
the type was set to ASCII.  Other than that, I dunno.    :>

>Any suggestions, or anywhere else I could get pkz110.exe?

Well, if you're not happy with this pkz110.exe, try getting it from:
"wuarchive.wustl.edu" in the directory "/pub/MSDOS_UPLOADS".

I don't think the pkzip in seq is corrupt (Chris?  Joe?), but you might try
the other just to be sure.

>Thanks for the time, folks.

Ain't no ting.

-- Rob 

---------------------------------------------------------------------------
                      / a) 4
Q: 4 / 1 is?     A: --+ b) 1
                      \ c) The reason Van Halen kicked David Lee Roth out.

("Breakfast Club Zoo" -- 97.5 KMOD, Tulsa OK)
---------------------------------------------------------------------------
Rob@K-State.Manhattan.Kansas.USA.Earth
To the computer: windsor@matt.ksu.ksu.edu
Newsgroups: comp.sys.hp48
From: kolstad@cae.wisc.edu (Joel Kolstad)
Subject: Re: speeding up the 48SX
Organization: College of Engineering, Univ. of Wisconsin--Madison
Date: 13 Oct 92 22:41:54 CDT

Hi Joe,

In article <2ada6912.1876.1comp.sys.hp48.1@hpcvbbs.cv.hp.com> akcs.joehorn@hpcvbbs.cv.hp.com (Joseph K. Horn) writes:
>
>On page 2 of the PLOTR menu, see the RES softkey?  Type #2 and press RES
>to speed up your function plots by a factor of 2, which should make your
>races against friendly competition more equitable.  Or try #3 if you want
>to beat them.  Or #4 to blow them into the weeds.

Um... but isn't that cheating?  Don't the Casio's and Sharp's normally
do the equivalent of #1 RES?

>The HP is slower for several reasons.  For one, it has no fixed display
>memory, but allows you to create HUGE graphic screens (try #256d DUP
>BLANK PICT STO before graphing a function!) which can then be scrolled
>around or printed all at once.

Nah, you don't really think that adding a couple of offsets takes that long,
do you?  (It only happens 131 times, after all...)

I'd be willing to bet that evaluation routines for your formulas are simply
significantly slower, because a lot of them are coded in RPL.

In fact, Rick H. has reported that the TI-85 tends to be faster than the 48
in general, and I think this is due to the fact that the 48 consists of
RPL for most of the OS.  I don't know if the hardware in the 85 is much
faster, though.  But HP may well speed up the 48 one of these days...

						---Joel Kolstad
Newsgroups: comp.sys.hp48
From: r0h7630@tamuts.tamu.edu (Rithea Hong)
Subject: Stack display suggestion
Organization: ~/lib/organization
Date: Wed, 7 Oct 1992 07:14:50 GMT

I've got a little suggestion.  I like haveing commas separating the digits
of large numbers because it makes it easier to read off quickly.  However,
the 48 only does this when in fix mode.  This has the drawback of having 
trailing zeros in the display.  Also, commas won't be displayed for tagged
objects such as things with units and physical constants.  Sooooo could
someone modify one of the stack viewers such as Hyperstack to give you the
option of displaying commas and do so for objects with labels?  

From: rrd@hpfcso.FC.HP.COM (Ray Depew)
Date: Tue, 13 Oct 1992 15:02:40 GMT
Subject: Re: Card carrying cases?
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: comp.sys.hp48

In comp.sys.hp48, jhawk@panix.com (John Hawkinson) writes:

> Does anyone know if there are any carrying cases available for
> hp48s expansion cards? Perhaps along the lines of those collapsable
> 3.5" disk cases?

Conan Fee just asked the same question:

> I have 4 RAM cards and I use my HP48SX in several locations and
> use features from the various cards irregularly.
> 
[...]
> 
> Has anyone got a good way of keeping these things near the 48 ie: making
> them as portable as the 48? I thought of using the quick reference booklet
> pocket but the cards might get damaged.

Just for fun, I pulled my billfold out of my pocket, and my EqLib card out of 
my 48.  The card really *is* the same size as a credit card!  I tried slipping 
the card into the credit-card holder -- you know, the clear plastic accordion 
thing where you put your girlfriends' pictures instead of credit cards?
The ROM card fits great.

Rather than spend the money on an entire billfold, you can buy just the 
accordion insert.  This should fit fine in the booklet pocket on the 48's case.


Regards
Ray Depew
Integrated Circuits Business Division
Hewlett Packard Co, Fort Collins, Colorado
rrd@hpfiqa.fc.hp.com

P.S.  I wouldn't recommend putting a ROM/RAM card into your billfold.  The 
cards don't flex enough....
Newsgroups: comp.sys.hp48
From: mheiskan@hut.fi (Mika Heiskanen)
Subject: Re: System RPL Questions
Reply-To: mheiskan@.vipunen.hut.fi
Organization: Helsinki University of Technology, Finland
	<MHEISKAN.92Oct5204934@lk-hp-9.hut.fi>
Date: 06 Oct 92 23:31:15 GMT


>Internally key presses are handled by DoKeyOb. If pressing a key leads to
>executing a secondary, DoKeyOb checks that the first command is TakeOver.
>If not, pressing the key gives an error beep. Else the program is executed
>(TakeOver is a null secondary). Thus TakeOver is an identifier for valid
>programs to execute by a key press.

>Here's a disassembly (<-RPL->) of what DoKeyOb executes for secondaries:

>::
>  PTR 40792 (TakeOvered?) case EVAL
>  DUPROM-WORD? case PTR 4051C  (So internal XLIBs don't need TakeOver..)
>  PTR 11511 (PrgmEntry?) caseDrpBadKy
>  PTR 408F0 (Key handled in edit mode)
>;            ~~~~~~~~~~~~~~~~~~~~~~~~~

Oops. PrgmEntry? gives TRUE if PRG annunciator is on, ie editing is on.
Thus if secondary isn't TakeOvered, and PRG is on, errorbeep results.

Here it is with correct comments:

::
  PTR 40792 (TakeOvered?) case EVAL
  DUPROM-WORD? case PTR 4051C  (So internal XLIBs don't need TakeOver..)
  PTR 11511 (PrgmEntry?) caseDrpBadKy (If PRG is on, error)
  PTR 408F0 (Normal execution with aENTER and bENTER checks)
;

Note that it may not be always wise to put TakeOver to programs.
If you assign this to a userkey :: TakeOver %1 ; it will execute even if
editing. Not very useful I guess.

Why put TakeOver then? Well here's an example

:: TakeOver
   DEPTH #0=case
   :: $ "Nothing to insert" FlashWarning ;
   PTR 3EEEC (pop stk1 to cursor location)
;

If you assign this to ->RCL, you can insert stack objects to the program
you are editing. If the TakeOver wasn't there, 48 would just beep.


Also, here's what TakeOvered? accepts:
TakeOver
:: TakeOver <rest> ;
:: :: TakeOver <rest1> ; <rest2> ; (There is an internal TakeOver' entry)


Sorry for the wrong comments that caused some misunderstandings.

>--
>--> mheiskan@vipunen.hut.fi





--
--> mheiskan@vipunen.hut.fi
Date: Tue, 13 Oct 92 22:38:15 +0100
From: Wolfram_Sauerteig@hippo.fido.de (Wolfram Sauerteig)
Subject: Re: Regressions
Newsgroups: comp.sys.hp48
X-Comment-To: n9244414@henson.cc.wwu.edu (Alex J Peachey)
Organization: SauerSoft 


Hello Alex J Peachey, You wrote to All with subject "Regressions" :

AJ> I have both a TI-81 and an HP48SX.  I KNOW that my HP is a much better
AJ> machine but I can't find how to do a very useful function on HP that can
AJ> be done easily on my TI.  On the TI I can do a linear, Power, or Exp
AJ> Regression.  On the HP I can only figure out how to do a linear regression.
AJ> How can I do the others?  I can't find it anywhere in the manuals.
AJ>
simply press <left shift> <stat> , three times <nxt>, and then <modl> (the very 
right menu button); you'll get a selection menu and may choose, which model 
will be used by the LR function.

bye
    Wolfram