What's the correct hex modification for 500Hz USB in XP SP3?

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marzsyndrome
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Joined: Sun May 28, 2006 6:01 am

What's the correct hex modification for 500Hz USB in XP SP3?

Post by marzsyndrome » Thu Sep 02, 2010 12:43 pm

I don't know why, but no patches or programs I've tried so far can get the speed above 250Hz. I'm using version 5.1.2600.5551 of usbport.sys, as included in this update pack.

Is it some kind of new hardcoded limit MS implemented or something?

marzsyndrome
Posts: 239
Joined: Sun May 28, 2006 6:01 am

Post by marzsyndrome » Fri Sep 03, 2010 9:47 am

Wow, after consulting this page I found through Google (pardon the alien tongue ;)) and hex-editing the file manually, I restart and...... still 250Hz. What the hell?

I should add that when I made my custom XP CD recently, I asked nLite to patch it to 500Hz. So something's definitely up.

yumeyao
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Post by yumeyao » Fri Sep 03, 2010 10:27 am

The file may be restored by Windows File Protect before your reboot. You should delete the file in system32\dllcache and eject your Windows XP Install CD first, then hex-edit it.
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marzsyndrome
Posts: 239
Joined: Sun May 28, 2006 6:01 am

Post by marzsyndrome » Fri Sep 03, 2010 1:39 pm

I patched sfc_os.dll with RyanVM Integrator, so that can't be it. The driver isn't in the dllcache folder either. I'm sure if it were being replaced, I could tell by the datestamp, plus it would be outputting the default value of 125Hz and not 250Hz.

I might try getting the 5.1.2600.5512 version of the file and see if that lets you go above 250Hz. If so then it's obviously the current file in the Update Pack that's the issue.

marzsyndrome
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Joined: Sun May 28, 2006 6:01 am

Post by marzsyndrome » Sat Sep 04, 2010 7:51 am

Nope, didn't change things at all. This is seriously hair-tearingly frustrating now!

I'm going to ask on MSFN and see if they have any clue.

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