500mA would be entirely exorbitant for that purpose. When Mac OS X does = not know the power requirements of a device, it always shows 500mA, the = largest allowed under the USB spec. Some devices are programmed with = their power requirements along with device ad vendor ID's. The power = requirement as indicated by the computer is always either the value = coded into the device, or 500mA under OS X, or Unknown on some OS's. I = personally have a USB keyboard I use on my PowerBook G4, which is rated = for 35mA as shown on the bottom of the device, and in its manual, = however Mac OS X shows 500mA. Same with my 50mA Logitech TrackMan = Marble USB trackball mouse. NPK ----- Original Message -----=20 From: "Galen" <blueandwhiteg3@xxxxxxxxxxxx> To: <kismac@xxxxxxxxxxxxx> Sent: Monday, May 28, 2001 5:50 PM Subject: [kismac] Re: GPS USB to Serial Compatibility > A few replies to various posts: >=20 > >>> What are the "right" drivers? The adapter came with nothing but = Palm > >>> Desktop software. > > > > You may run into a problem here... IIRC, the Palm USB cable is just > > that, a cable. The Pal Pilot itself does all of the protocol > > translation, similar to my Kodak Digital Camera which had a DIN-8 > > plug on the camera itself, and the a choice of a USB cable or a = 9-pin > > Serial cable to transfer images to your computer. The Camera > > actually has both interfaces built into it, and merely senses which > > type of cable is attached to it. > > > > Also, IIRC, your standard Serial and USB do not use the same types = of > > data transmission (I.e. Tx, Rx, RTS, DTR pins going high/low to > > represent data...) Which is why devices like the Keyspan USB-Serial > > adaptor are still rather bulky. >=20 > This thing is actually an adapter and, when I bought it, wasn't = exactly=20 > cheap. It is a USB cable and a rather long box-like thing that has a=20 > standard serial port on it so I suspect it is at least partially a=20 > serial to USB adapter. It certainly has to change around some data for = > the USB bus, and it seems to have a pretty good power requirement (500 = > mA). Furthermore, it shows up on the USB chain without anything=20 > connected, so it at least has a full USB controller chipset on it. >=20 > >> What are the "right" drivers? The adapter came with nothing but = Palm > >> Desktop software. > > > > There are quite a few drivers for various chipsets Serial to USB > > connectors around. Just try them. You may find them listed under the > > 'software' button or 'support' button of resellers. I have a few > > drivers available for those interested. >=20 > Can you give me some suggestions? I could just hit all the Mac OS X=20 > sites for serial to USB adapters, but I'm guessing there are half a=20 > dozen drivers or more available, some of which might conflict, so I'd=20 > probably have to install each one, test it, and then uninstall and=20 > repeat with the next driver. Or, if you have some interesting driver=20 > that isn't generally available, drop an email directly to me. >=20 > ASP reports my adapter as follows: > "USB Serial Adaptor" > "Product ID 128 ($80)" > "Serial Num 00337462" > "Vendor Palm Computing, Inc." > "Power (mA) 500" >=20 > I'm not sure that's very helpful to anyone (it doesn't exactly specify = > the chipset or anything like that) but it might be. >=20 > I'm borrowing the GPS device (Garmin eTrex Vista) on thursday = afternoon=20 > (PST) and will give it a try. I'll let you know how it works. I'm just = > borrowing it to give it a try, I am probably going to get a Garmin=20 > eTrex Legend GPS, the model just below the Vista (less memory, no=20 > electronic compass or barometric altimeter) with the same data=20 > interface, same design, etc. >=20 > > > >> P.S. Does anybody know why it sometimes takes up to a few days for = the > >> emails I send to this list to get sent out to everyone in the list? = In > >> this case, my original message was sent on the 26th at 2:25 AM but > >> didn't get sent on the mailing list until the 28th at 12:25 am. > > > > Well, today you seem up to speed. >=20 > This is quite odd. I'm on other lists (not at freelists) and I've = never=20 > seen this happen and I've never seen any significant (>5 min) delay in = > email getting to a person's inbox. >=20 > Galen >