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Candy wrote: The situation that you'd get a USB mouse that doesn't work with the HID standard, but that DOES work with your BIOS is a paradox.

Just to make sure I didn't miss something essential around me - is there really such a thing as usb-to-ps2 emulation for mice? I've only seen it for keyboard so far..

cheers Joe

(oops. sorry for the poor example. i just picked up another PS/2 device. my bad)

It would be logical however, both conform to the USB HID and both are used through the same (simulated) PS2 controller chip.

Just one thing, how do you catch a write to a port number in software? Are you sure that it isn't a very weird thing to be able to catch?

Hi,

Candy wrote:Just one thing, how do you catch a write to a port number in software? Are you sure that it isn't a very weird thing to be able to catch?

I think the chipset itself detects the access and triggers an SMI - the Intel manuals aren't particularly descriptive (probably need to dig the depths of chipset manuals to find something conclusive)...


Cheers,

Brendan

on the other side, the chipset can simply offer the 'traditionnal' ports for PS/2 and stuff, and translating them directly into USB commands ... since both USB host controller and 8042 emulation occur on the same chipset chip, i don't see why SMI should even be involved in the process ...