Sorry for asking another question....

So, if so motherboard support USB/keyboard (hardware-level emulation), then is
the keyboard will still taking the IRQ1 and PS/2 mouse takes IRQ12 ....???

Then, how come people said that USB device won't need IRQ?

For standard PC, there are just 15 IRQs. Now, most of them are used up. For an
example, if my PC is attached with a lot of USB device (let said USB 10
devices and 2 USB 7-port hubs ), then if not enough IRQs, then how those USB
devices talk to the PC (host)???

Thank you.

regards,
William



Bob Ammerman wrote:

> Some PCs have BIOS support for USB mice/keyboards - I believe that this is
> to the extent of providing hardware-level emulation of the legacy devices.
>
> Bob Ammerman
> RAm Systems
> (contract development of high performance, high function, low-level
> software)
>
> > Dear All,
> >
> > (1) If USB mouse or USB keyboard is used under Windows environment, they
> > can easily be detected. Then, if I use USB mouse and USB keyboard in
> > DOS, then how can both of them be detected?
> >
> > Or, if I buy a new DIY PC with USB mouse and USB keyboard, then, how can
> > I configurate my BIOS and setup my Windows OS (before any USB driver can
> > be loaded)? Then, it seems that I also need (or borrow) standard
> > keyboard .....???
> >
> > -------------------
> >
> > (2) Then, can USB be the futher peripheral interface?
> >
> > regards,
> > William
>
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