Messages

1

C1000/3x00 Hardware / Charging Via Usb?

« on: March 14, 2006, 07:57:29 am »

Well, it does not matter if a device is connected or not:
If there is realy a difference in potential, there will be current flow. But the current flows from one USB port with the higher potential to the one with the lower potential. Not through the connected device.

That current flow (or better: The connection of the two terminals with different potential) will make the two potentials on the terminal to the connected device equal. That means, the connected device will not know anything about that current flow / potential problem.
The only problem could be that the voltage on the Zaurus side of the cable will be modified so heavily that it is not suitable anymore for the Zaurus. but that had to mean that at least one of the two involved USB ports must have a voltage way too far from 5V that it can be called an USB port. ;-)

BUT: I seriouly doubt that there can be a significant potential difference between two ports of the same hub, becasue hub manufacturers will use the same voltage regulators for each port. So port voltage difference can only be a matter of component parameter tolerances. Since the ports are designed to stand 500mA, a few mA more or less due to little potential differences are probably neglectible.

However, the point may be important if you connect a Zaurus with such a two-USB-plug cable to to different hubs! I would not do that.

daniel
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just to further update/ask a question - what if (i think these devices are available, if i'm not mistaken) we add "one-way resistors" to the wires coming out from each usb port, so that these will help discourage the presence of flowback into any usb port? will this make a viable, or useful "dual-usb" zaurus charger?

2

C1000/3x00 Hardware / Charging Via Usb?

« on: March 07, 2006, 12:49:51 pm »

Yes, that is certainly an issue of USB power.

Remember: USB ports of a powered USB device (computer, active hub) are specified to provide 500mA per USB port. The Z needs 800mA (at least this is the requirement for an AC adapter).

You could work around this problem by using two USB plugs in parallel, plugged into two USB ports. Some external USB hard drives are powered that way.

daniel
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sorry to bring up an old topic, but .. i believe this topic is still relevant to all of us Z users who might be interested in doing this.

Anyway, my question is, will the electrical potential between the two usb power lines create a problem when no Z is plugged in to the other end? I am not an electrical engineer, so i wouldnt know, but from my own "sense" of understanding things, it will be like two forces pushing against each other (electrons, or "current" wants to flow out) What if the current is unbalanced, with one usb port supplying slight more than the other? will that cause a "pushback" of current into the weaker usb port, thereby potentially causing damage to whatever equipment is behind the weaker usb port? And then what if the two are equal? will it cause any potential "strain", or damage still?

thanks for bearing with my electrical ignorance,
-jf

3

C1000/3x00 General discussions / Problems With Keyhelper/keyhelper.xml

« on: September 28, 2005, 12:37:16 pm »

does anybody else encounter the same problem as me? Ctrl-E doesnt work either (go to the end of the line), while Ctrl-d still does work...
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whoops, my bad, folks!! apparently, there's a lot more going on in the xml file than i thought... My apologies.

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C1000/3x00 General discussions / Problems With Keyhelper/keyhelper.xml

« on: September 28, 2005, 04:23:39 am »

does anybody else encounter the same problem as me? Ctrl-E doesnt work either (go to the end of the line), while Ctrl-d still does work...

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C1000/3x00 General discussions / "translator" App Not Working - Ej Dict Not Exists

« on: September 28, 2005, 02:45:30 am »

btw, sorry, Meanie, if my post in any way implied that it was ur fault that i couldnt find the dictionary. Anyway, while we're at it, is there anything else that a fresh /hdd3 should have that is wiped out by a factory reset?

6

Sharp ROMs / Mplayer Codecs?

« on: September 27, 2005, 10:18:40 pm »

I have (finally) gotten mplayer and kino2 working, but I can only seem to play vanilla mpeg files...even though I downloaded the codec pack from mplayerhq.hu (was this a good or bad idea)?  When I try to play a wmv file, it complains about the codec (wmv9mod something something) What should i do?
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i think the codecs are meant for i386 machines, but can someone confirm this?

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C1000/3x00 General discussions / "translator" App Not Working - Ej Dict Not Exists

« on: September 27, 2005, 10:18:00 pm »

argh!! i did a factory reset already... But thanks for telling me where to find (and install) the stuff!! i'll try it out right now...

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C1000/3x00 General discussions / "translator" App Not Working - Ej Dict Not Exists

« on: September 27, 2005, 10:00:07 pm »

Open up Add/Remove programs and see if they are installed - called Translator-ej and translator-je from a very questionable memory

Stu
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hm, apparently they are not!!

sorry about this, but how do i install them? I am taking a look at cd1 now, and there are a lot of files in /cdrom/dict1/translator (i assume this should be the correct dir). Just how exactly do i install these files? Would appreciate any help i can get (i wish to learn more Japanese!!)

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C1000/3x00 General discussions / Idea For A Good Backup Solution

« on: September 27, 2005, 09:52:16 pm »

about the backup/restore utility that comes with the Sharp ROM - it seems that it does sort of boot the system into a single-user mode!! (my guess) - cos after activating it, u'll see that screen that u see when u first boot it up...

So the sequence goes - boot screen, backup starts, boot screen again, configure timezone screen.

oh, and btw - i discovered something interesting in /hdd1/.sys - there's this file called 'hdimage2.tgz' which is apparently a backup of the "standard" stuff in hdd3?! (and a few folders in /hdd2 - namely 'lost+found', and '.sys') Have a look at it...

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C1000/3x00 General discussions / "translator" App Not Working - Ej Dict Not Exists

« on: September 27, 2005, 01:46:33 pm »

sorry - to be more specific, when i click on "Translator", i get a messagebox with the message "EJ Dict not exists". I click on "OK", and i can get into the app, but attempting to do any translation will result in either "JE Dict not exists", or the "EJ Dict not exists".

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C1000/3x00 General discussions / "translator" App Not Working - Ej Dict Not Exists

« on: September 27, 2005, 01:39:13 pm »

anybody encountered this error before? this is from a fresh 3100, with the only customizations being those from hluc's site, which is supposed to keep the dictionary around! so what gives?

12

C1000/3x00 General discussions / 3100 Localisation Problem - I Can't Find My Term!

« on: September 27, 2005, 12:48:34 pm »

thanks, GadgetGuy!! I managed to get the terminal installed. Now where is that 'Escape' button?
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got it!! the 'Cancel' button...

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C1000/3x00 General discussions / 3100 Localisation Problem - I Can't Find My Term!

« on: September 27, 2005, 12:43:08 pm »

thanks, GadgetGuy!! I managed to get the terminal installed. Now where is that 'Escape' button?

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C1000/3x00 General discussions / 3100 Localisation Problem - I Can't Find My Term!

« on: September 27, 2005, 11:50:19 am »

sorry, guys!! refined my search on google, and managed to find something. Apparently, the terminal app (according to https://www.oesf.org/forums/lofiversion/ind...hp?t15161.html) is not installed by default!! I'll see what i can do to install the terminal...

Any instructions, guys?

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C1000/3x00 General discussions / 3100 Localisation Problem - I Can't Find My Term!

« on: September 27, 2005, 11:40:47 am »

sorry, guys, but can anybody help me out here? has anybody encountered this problem before?