I am not the author of this great ARM clock speed changing software, but as I could find nothing in English about it I thought I would add this brief unauthorized (though friendly!) English documentation.

Legal disclaimer: By using this application, you agree to sue neither I nor Yishin/Yixing (the authors). There may be more limitations, but you'll need to be able to read Japanese to find out. This document can be freely modified if mistakes are found, or further information/clarification can be provided.

Speed allows you to change the clock speed of your XScale processor-based PocketPC. It requires XScale and does not work on earlier ARM devices (I tested on iPAQ 3630 (ARM) vs iPAQ 2210 (ARM XScale). If you want to overclock your ARM processor, search the web for "SpeedStepper", which is also free.

Brief technical background: The Intel ARM XScale processor is capable of being down-clocked to various speeds, though most of the PocketPCs that are released with XScale processors today do not provide software allowing you to take advantage of it. This nifty freebie from Japan fills in that gap!

Why underclock your ARM?
While underclocking your ARM probably won't help you "find your soul mate",

    "Hi, my name is Zee, and I underclock my ARM"

it should reduce the amount of battery power your device requires. Many programs don't really need the faster speed to operate, such as reading email or doing work in Contacts. I have only tested this software and have not really verified that it does save battery power, but in theory, it should.

Overclocking and Tech Spec[ulation]s
If you don't know and don't want to know about all this technobabble, skip to 'Using Speed' below.

This utility should work on the PXA250 and PXA210 processors, and possibly future versions of the XScale. The PXA250 chip comes in speeds of 200MHz, 300MHz and 400MHz. If you have one of the slower processors, 'Speed' should allow you to overclock your ARM. If your device has a 400MHz processor, Speed will only be useful for underclocking your ARM. I tried a brief test to see if I could increase the speed of my bus from 99Mhz to 199MHz (hey, it was worth a shot!) but it did not appear to do anything.

I do not have a 200Mhz or 300Mhz device to test this on, but as it did a fine job of underclocking my iPAQ 2210, I suspect it will work for overclocking.

Using Speed
While it is generally against the law in the United States to use speed, this Speed is legal, can be shared with friends (while still having it all to yourself), and works for longer than 8 hours! <:*)

Seriously, you run the app and it displays a warning message, I suspect because of legal concerns:

    "This is danger program. Please use by own risk. Please backup your important data before push OK button."

Hey, their English is far better than my Japanese! :)

Click OK, and you'll see all your speed choices on the screen. There is no help (this is it, sorry). Your device's default/current settings are shown.

    MAKE A NOTE OF THE CURRENT SETTINGS!

    Format of choices: CPU clock speed/BUS speed

Unfortunately, the default bus speed is not shown (that's the second MHz number you see). My iPAQ has a 100MHz bus. I know this because I am a geek.

If you do not have an XScale processor, it will say "No XScale" and your only option will be to click the Exit button.

You'll see the standard XScale settings, and then some non-standard settings. The tender at heart might want to stick with the factory supported speeds.

When you click OK, the speed is changed and Speed (the program) drops to the tray. However, you can tap the tray icon and click "Exit" and Speed will end, but your changes will stay in effect.

If you leave it running, just tap the icon in the tray to run through the various speed settings. Double tap the icon to bring up the dialog screen again.

That's it! It's probably a good idea to return your device to the default when you are done with your task.

Additional Notes
Having finally found a decent Japanese-English translator at http://babelfish.altavista.com), I have found one more tidbit of information worth noting.

If you change the value of the MessageOff key to "1" in the registry, you can disable the intro message that pops up:

    HKCU\Software\yishin\speed\MessageOff (set to 1, default 0)

-mw

**** [Sep 3, 2004] by Arthur using hp 2210
Its a nice software you can change your speed from 400 mhz to 200 mhz.