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Question number B: Once I've written the ESCD, I still have to manually change the Reserved Resources from Device Manager.

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However the ESCD data may be held in a kind of NVRAM storage that does not tolerate "too many" writes, and could fail if blasted on every single startup for months on end. The Pn P manager queries devices for ID and desired resources, then allocates resources according to how everything fits together.

Plug and Play devices that are not required for boot are to remain quiescent until initialised by a Pn P manager.

There are generally 3 types of Pn P manager: 1) Pn P BIOS 2) Pn P OS 3) Add-on Pn P manager When there are two different Pn P managers involved (Pn P BIOS and Pn P OS), and they store thier data slightly differently, then the one may compare hardware with the settings stored by the other and see the difference as a "hardware change" and set about "correcting" it.

This is why one sees Pn P update wars, where ESCD gets updated on *every* boot and is sometimes a reason why Win9x may see "new hardware" on every boot.

The Plug-n-Play BIOS records this info in the ESCD table which is stored in NVRAM.

I can make BIOS calls to read NVRAM, but when I try to write, Windows returns an 'Invalid Operation' error.

The standard fix is to disable BIOS Pn P, so that only the OS does Pn P wake-up, assignments, and presumably ESCD updates.

If you leave "Pn P OS" = "Yes" in CMOS setup, this is what happens; Pn P hware may remain dormant and thus unavailable to non-Pn P OS (Linux, Win9x DOS mode, NT4). My preference is to set "Pn P OS" = "NO" in CMOS, then (if Pn P wars ensue) prevent Win9x Pn P from scribbling in ESCD (Device Manager, Pn P BIOS, Properties, Disable ESCD Writes, [x] ).

It is normal for the BIOS the check the PC each time it is initialized but it should not find any changed in the hardware unless there are any. There are mobo manufacturers that allow only a one time update. ) I would suggest that if 'something' Pn P is updated in any way (ie driver patch) then ESCD gets told about it and updates itself on the next reboot? -- Regards, Tim - [email protected] & Painting Holidays? If I get notified of such a behaviour I would check that PC. Intel's ICU also uses ESCD to store information for PNP ISA cards and legacy ISA cards. Some of the BIOSses allow you to remove this information from the ESCD record once you've removed the (legacy) card. ESCD BIOS plug-and-play Pn P Short for Extended System Configuration Data, a format for storing information about Plug-and-Play (Pn P) devices in the BIOS.

If another check is required the user has to enable the BIOS to update the ESCD. We build them from major mother board vendors and maintain both home grown and PCs from major vendors. Look for something like Reset Configuration Data, usually found in the PNP/PCI Configuration section of the BIOS. Windows and the BIOS access the ESCD area each time you re-boot your computer.

That gives OSs other than Win9x GUI a reasonable chance of working with Pn P hware.

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