Subject: Re: PS/2 Mouse vs. Serial Mouse
To: Chris G Demetriou <Chris_G_Demetriou@ux2.sp.cs.cmu.edu>
From: Charles M. Hannum <firstname.lastname@example.org>
Date: 08/16/1996 22:57:20
Chris G Demetriou <Chris_G_Demetriou@ux2.sp.cs.cmu.edu> writes:
> > - A PS/2 mouse port is a serial port specially designed for mouse use;
> > it isn't capable of variable speed transfer, and in some cases, is
> > input-only.
> I think you're right that it's fixed speed (like the keyboard port,
> no?), but i'm almost certain that it's not spec'd to be input-only.
Indeed, the protocol *requires* transmitting data in both directions.
You have to send it some bytes even to tell it to start sending data.
The `mouse' port is a second nearly identical channel on the keyboard
controller. I've been meaning to try plugging a second keyboard into