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From: correodejorge2 on 4 Nov 2006 15:27
Hi every one!

I have Hp 50g, the ROM version is "HP50-C Revision 2.08" and I can´t
use LINSOVE.

No matter what ecuations (linear of course) I intruduce (even the
example ones) I keep getting the error "LINSOLVE error: Invalid
Dimension".

Using SOLVE to solve the same linear systems I get the error "SOLVE
error: Not exact system"

¿What can I do to make LINSLOVE or SOLVE (with 2 or more ecuations)
work on my calculator?

I know that there are other options to solve systems of linear
ecuations like the A·X=B matrix way but it takes much more time than
the other methods.

Thanks

PD: I have look throught this group and found various threads that say
that the problem I have is some kind of bug of the ROM. If it is, then
my question is:

Will it be solved with the ROM 2.09 that is available in hpcalc.org? I
don´t want to change ROM if it is completely necessary and I´m sure
it is going to work.

PD2: Sorry for the spelling or the grammar if I made a mistake.

From: John H Meyers on 4 Nov 2006 17:53
On Sat, 04 Nov 2006 14:27:56 -0600:

> I have Hp 50g, the ROM version is "HP50-C Revision 2.08"
> and I can?t use LINSOVE.

That bug was fixed in ROM version 2.09;
although http://www.hp.com/calculators/graphing/50g/
*still* does not show that there is a newer ROM update for it!

You can download it from here, however:
http://www.hpcalc.org/hp49/pc/rom

[r->] [OFF]
From: John H Meyers on 4 Nov 2006 18:16
Addendum:

> Will it be solved with the ROM 2.09 that is available in hpcalc.org?
> I don?t want to change ROM [unless] it is completely necessary
> and I?m sure it is going to work.

The file at www.hpcalc.org was obtained directly from HP,
and it works (fixes the LINSOLVE bug);
when HP retired the 49G+ model from their web site
and replaced it with the 50G model,
they somehow managed to forget the original link
leading directly to the HP "update software and drivers" page,
thus slightly shooting themselves in the foot once again,
as people find that something doesn't work,
yet there's no hint from HP about an available update.

There are archived newsgroup posts giving
a direct link to where HP hosts that ROM update file itself,
but you'll get the exact same thing anyway.

It will come with instructions telling you that you must
purge your Equation libraries from flash and re-copy them
from the ROM update file, but if you want to save yourself
unnecessary work, do just the ROM update (there was
*no* update to Equation libs between 2.08 and 2.09)

[r->] [OFF]
From: correodejorge2 on 4 Nov 2006 19:47
Tank you very much. I´ll update to ROM 2.09 then.

If it works I´ll let you Know.

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