Messages

1

C1000/3x00 Hardware / Usb Host And Client

« on: August 15, 2007, 07:51:02 am »

In reality 5 volts does not "come out" of one side or the other. The direction of current flow depends entirely on the voltage difference, which would be small for two self-powered devices as both sides hold their power pin at the same potential relative to their common ground.

But the direction of current flow is unknown and the current flow is not limited.

Anyway, the difference between host/client plugs is not just physical; one pin tells the socket what kind of plug it is. The USB charge pump IC which supplies the Z's USB power pin uses this to perform whatever power isolation is required.
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The secret being that the 5v host voltage is only connected when pin 4 is grounded so it looks like I need 5volts internal somewhere and a PNP transistor with base to pin 4 and emitter to pin 1 (with the odd resistor or two). FET being a better option probably.

Cheers

2

C1000/3x00 Hardware / Usb Host And Client

« on: August 15, 2007, 07:16:44 am »

Does anyone know enough about the host / client system on the Zaurus to tell me how it prevents damage when a client cable is plugged in.

With a client cable 5 volts is supplied from the host. This comes in the same pin as the 5 volt comes out of when a host cable is plugged in (I think). Why does this not cause a problem?

Reason for knowing.
I just bought a Nokia 770 and the USB native mode is client but it can be made into a host port. Given that the Zaurus does both at the same time and that the only difference between the two physically is the shape of the metal surround (small pliers and brute force fix that problem) I was going to look at making the 770 the same.

3

Off Topic forum / Looking For Linux-compatible Mp3 Player

« on: October 15, 2006, 04:12:52 am »

FYI all the Philips ones (the HDDXXX series) use the database storage method as well so you can use it as a USB stick but can't play the files you copy withuot the flaky SW that they supply for Windose.

4

Off Topic forum / Tomtom Go 300

« on: October 14, 2006, 05:47:38 pm »

Is there anyone with an indepth knowledge of the TOmTOM boot sequence. I have what appears to be a blank tomtom go 300. I bought it as one of the ones with faulty voltage regulators, only the power LED worked when power was applied. Having ripped it to bits and looked all the voltages are fine, I can tell from the current draw that it is turning on, the current draw also tells me it's trying to do something but no screen and no noises. There is data buis activity on the processor and generally about the thing inside. I reckon it's flash is erased but I can't find squat about it on the net. Opentom gave me no clues.

I am probably looking for jtag information or serial console boot information or similar that will allow me to see what isn't going on.

5

Software / Free Sudoku - Now All Zaurus And Archos Supported

« on: July 29, 2006, 10:50:00 am »

If they can be seen they can be removed, it's just binary.

It isn't easy or quick but they can be removed.

6

Software / Free Sudoku - Now All Zaurus And Archos Supported

« on: July 29, 2006, 10:18:31 am »

So in truth if someone doesn't want to release the source all they need to do is say that it was written in machine code and there is nothing that anyone can do about it because the binary is all there is, no one can prove otherwise and the source is distributed when the binary is given out.

No, this is wrong. A compiler always leaves his own particular tracks in the binary. So, by looking at the binary you can always find out that it was compiled.
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This is just not true. All those bits can be removed if required. It isn't an easy job but it can be done if you are determined not to release source code and don't want to break the GPL.

7

Cxx0 General discussions / C860 Wont Boot

« on: July 29, 2006, 06:55:10 am »

The charger will not be causing any problems unless it is faulty.

Looks like NAND problems to me.

8

Software / Free Sudoku - Now All Zaurus And Archos Supported

« on: July 29, 2006, 06:52:51 am »

So in truth if someone doesn't want to release the source all they need to do is say that it was written in machine code and there is nothing that anyone can do about it because the binary is all there is, no one can prove otherwise and the source is distributed when the binary is given out.

9

Software / Free Sudoku - Now All Zaurus And Archos Supported

« on: July 29, 2006, 05:19:35 am »

I look at this and find myself sitting well and truly on the fence

I can see the "thin end of the wedge" view and it is absolutely valid but on the other hand this wedge seems to get thinner and thinner so strictly speaking every time I write a bit of C code to crunch some numbers or swap some entries in a file I should clog the Internet up with it, I would find it really embarrasing to post 1st drafts of anything I write and this would stop me releasing anything I wrote until I had chance to comment it and order it all, so in this case should the binary not have been given away until the source code was ready for release? That sucks.

At what point is the GPL broken? If I had written it and given the binary to a mate and he had then passed it to a few mates and then it had been put on a web site where was the GPL broken if I don't give my mate the source, he would have been unlikely to want it anyway.

I tried reading and understanding the GPL license a few years ago but it has the same effect on me as reading or talking about patents (yawn).

10

C1000/3x00 General discussions / Ubuntu, This New Distro Of Linux Exist For Zaurus?

« on: July 27, 2006, 06:03:21 pm »

I tried LFS, jesus at least 4 days of my life wasted, I couldn get it to go anywhere.

11

C1000/3x00 General discussions / Ubuntu, This New Distro Of Linux Exist For Zaurus?

« on: July 27, 2006, 05:17:37 am »

apt-get bakes my noodle, emerge is much better IMHO, in fact Gentoo overall is way better than anything else I have tried once you get past the first install.

12

C1000/3x00 General discussions / Ubuntu, This New Distro Of Linux Exist For Zaurus?

« on: July 27, 2006, 02:58:27 am »

It does work OK on laptops but it is a long way off the best version of Linux.

I suspect someone is confusing "best" with "easiest to install"

13

Deals and Great Z Buys / For Sale - Bricked C860

« on: July 23, 2006, 07:47:27 am »

Where are you?

14

iPAQ Forum / Which Ipaq Is Right For My Project

« on: July 17, 2006, 02:27:59 pm »

That linksys is the one I used in my Ipaq and it was fine.

15

6000 - Tosa / 6000 Dismantled.

« on: July 17, 2006, 03:40:34 am »

If all else fails send it to me or bring it and we will give it a right royal sorting under the microscope