Are Mouse/Keybord low speed or full speed devices?

[tkafafi]

Are Mouse and Keyboard typically low speed or full speed devices ? Is there a way to tell from windows device manager ? Are there full speed mouse/keyboards out there ?

Thanks
Tamer

[Jan Axelson]

Low speed can do the job though I seem to recall there was at least one full-speed keyboard. If you can view the descriptors, bInterval < 10 means it's full speed. Also, compliant low-speed devices have attached cables, so if a device has a receptacle rather than an attached cable, it's likely full speed. Why do you want to know?

Jan

[Barry Twycross]

Some devices have tried to cheat the 10ms limit for low speed. Given this conflicts with a workaround for some controllers, we always know those back down to 8ms. Gamers want more resolution from their mice and some of them might either cheat or be full speed.

We've shipped full speed keyboards because they were integrated with hubs. It seems it was easier to make the keyboard full speed, than attach it low speed.

I've also known low speed devices with detachable cables, even from design houses which should know better.

[Guido Koerber]

Some gamers have the misconception that they need a full speed mouse to be able to react fater. Actually with 125 Hz report rate a low speed mouse is below the perceptible latency for gaming. What can make a difference though is to have a mouse that reports more than 8 bit per axis to allow higher top speeds to be transfered.

A mouse reporting 16 bits at low speed beats a mouse reporting 8 bits at full speed when precise and fast reaction in a first person shooter is what matters.

[tkafafi]

Thanks every body for the responses.

So then do the FS keyborads & mice use the normal device class drivers or do they need custom drivers ?
I would have thought the drivers would be agnostice to the speed (LS, FS, even HS ..) , is that not the case ?

Thanks

[Jan Axelson]

The devices can use the class drivers. Filter drivers can support device-specific features.

Jan