Cable to connect HP49G to PC
Richard Rietzler
I扉e just got a new HP49G, ROM-Version 1.05, SN 93xxxxxxx. Now i want to
update the calculator, but i have not the original PC-Connectivity-Kit from
HP(its to expansive...). I got quite much information at hpcalc.org. I惴 a
bit confused:
Can i cut the original cable, which i use to connect two HP愀, adapted it to
an serial port, download the software from HP and flash the new ROM? Or will
i get problems? -> Serial buffer bug?
Have someone some experience with that?
Thanks a lot for help!
Richard
Micah
else. The schematics are all on hpcalc.org. Unlike the TI, there are no
resistors in required. Just make sure to do the tests described before
plugging in your calc. The website for the latest ROM is:
http://www.epita.fr/~avenar_j/hp/49.html
And yes, it is BETA software but I highly suggest (as will everyone else) to
use that one instead of HP's official release.
Micah
"Richard Rietzler" <riet...@gmxpro.de> wrote in message
news:9ve5b6$acr$1...@news.urz.uni-heidelberg.de...
Richard Rietzler
"Micah" <ai...@aien.com> schrieb im Newsbeitrag
news:m2yS7.55081$Yy.650421@rwcrnsc53...
PawlRevere2
that only one end will work for connecting to the computer. Because DB9 TX/RX
will be connected to TX/RX on the end the will not work (obviously). On the
other end TX/RX will connect with DB9 RX/TX, which does connect!
rc...@eng.morgan.edu
i am not sure if i understood you rigth. you should be able to split the cable
in half and use one end for the HP49G and the other to the computer (connector
DB9). now, with the other piece (the one left), you could put another DB9
connector (but male) and connect it to the other DB9, that way you can also use
it -> HP49G to HP49G.
[HP49G]----[DB9 female]--//--[DB9 male]-----[HP49G]
______________________ __________________________
(connects to computer) (makes a complete HP49G to HP49G cable)
*there are only three wires you shoud be concerned (TX, RX and Ground)
the RadioShack part numbers are:
DB9 female PN:276-1428 $1.50
DB9 male PN:276-1427 $1.50
but, if you have just purchased a brand new calculator and it didn't come with
cable, you could call HP and ask them to send you one for *free* since they are
shipping them with cable!!
regards
In article <20011215073435...@mb-fd.aol.com>, PawlRevere2 says...
PawlRevere2
to spend more than I had to!
Julian Fondren
> Yes, you can cut the cable and plug it right in to a RS-232 or something
> else. The schematics are all on hpcalc.org. Unlike the TI, there are no
Be sure to also read (and mind the linebreak)
http://cgi-bin.spaceports.com/~hpkb/view.php?code=5e1ca6b67d16fcb7b82e60f97d517b94
which can shed some light on why some people won't just fork money
over to professionals like those people of www.samsoncables.com
> And yes, it is BETA software but I highly suggest (as will everyone else) to
> use that one instead of HP's official release.
As will *no one* else, you fool.
> Micah
Christoph Giesselink
news:9veb5q$c7t$1...@news.urz.uni-heidelberg.de...
> And what about this mysterios "serial-bug"-problem?
>
Marcel Flipse found a hardware bug in the schematic of early HP49. This was
fixed in later (fall 1999?) versions. The RS232 driver should also work as
current limiter in the case of switched or wrong connected cables. This
don't work on the first versions. Because of this bug wrong connected serial
cables could destroy the serial driver interface of the HP49G. There also
some mysterious connection problems known from people who try to connect the
first HP49G versions with a Mac. I personally have two early HP49G with the
serial-bug, both work well on my PC's. But I never tried to use a wrong
cable. So be careful when making your own cable. It's not so difficult at
all, I made two so far. Both HP49G and my HP38G are still alive.
Cheers
Christoph
Colin Croft
> It's not so difficult at
> all, I made two so far. Both HP49G and my HP38G are still alive.
I went to my local electronics supplier and tried to find a match for the plug
that goes into the top of the HP38G. They tried various different ones and
couldn't get a good enough match for the pin spacing. In the end we concluded
that HP had used a proprietary version that was not used by anyone else. What
did you use? Is it commonly available? I ask because I often get enquiries via
my website from HP38G & HP39G users about whether they can make their own and
I've had to say to them I can't help. (My knowledge of hardware and soldering is
very limited - I'm a software sort of person.)
--
Colin Croft
"Old mathematicians never die; they just lose some of their functions. "
======================================
Applications in Mathematics
ccr...@iinet.net.au
http://members.iinet.net.au/~ccroft/
======================================
rc...@eng.morgan.edu
i couldn't find a connector with the HP spacing either but you could make one!!
you can make a very small PCB (printed circuit board) with only 3 pins that
maches the spacing. in fact, if you take apart a HP49G connector, there is a
tiny PCB inside! i modified my connector so that i can also use the pin for the
5 volts power (used for the external projector).
but i don't think many people would go as far as me. he he
regards
In article <3C1ED41F...@iinet.net.au>, Colin Croft says...
Christoph Giesselink
Abrevations
mil = milli-inches
mm = milli-meter
available in the HP-Units catalog.
The HP serial connector dot pitch has the European format 2 mm in opposite
to standard device dot pitches from
100 mil = 2.54 mm
75 mil = 1.905 mm
50 mil = 1.27 mm
The 2 mm dot pitch is nearly often use by companies for connectors when they
only have little room. I got my 10 pin 2 mm dot pitch connectors from used
PCB's. I cutted the outer pins on the bottom side (only the three in the
middle are use), so I was able to solder the connctor on a 100 mil dot pitch
PCB. A paper clip, a cable, a 9 SUB-D female connector and some glue and
ready was my own cable. Sorry I haven't a camera yet to show you the result.
Cheers
Christoph
"Colin Croft" <ccr...@iinet.net.au> schrieb im Newsbeitrag
news:3C1ED41F...@iinet.net.au...
Colin Croft
> > And yes, it is BETA software but I highly suggest (as will everyone else) to
> > use that one instead of HP's official release..
>
While we're on the subject of beta software, people should be aware that, to my
knowledge, the version of HPGComm (the connectivity software for the HP38/39/40G) that
comes on the CD supplied with the cable is a buggy version (although perhaps not bugs
that the average user would run across). It was still in testing when the CD had to be
burned. If you use it then get the latest version either from the author's page or
from my site (below).