IIRC they auto detect (or can be changed with a switch on the bottom) what
kind of port they are connected too (probably by using voltage levels) and
adjust to match. TTYL


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Michael Rigby-Jones
> Sent: Thursday, May 17, 2001 09:36
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: Simulating clicks of a mouse
>
>
> So how come *some* PS2 mice will work on a serial port using a simple
> passive adapter cable?  Does these mice provide both protocols on
> different
> pins of the PS2 plug?
>
> Regards
>
> Mike
>
> > -----Original Message-----
> > From: Bob Ammerman [SMTP:RAMMERMAN@PRODIGY.NET]
> > Sent: Thursday, May 17, 2001 1:49 PM
> > To:   PICLIST@MITVMA.MIT.EDU
> > Subject:      Re: [PIC]: Simulating clicks of a mouse
> >
> > A PS/2 mouse uses TTL levels and a clocked synchronous protocol.
> >
> > This is _nothing_ like the RS232 protocol used by a serial MS mouse.
> >
> > Bob Ammerman
> > RAm Systems
> > (contract development of high performance, high function, low-level
> > software)
> >
> > ----- Original Message -----
> > From: "Dale Botkin" <dale@BOTKIN.ORG>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Thursday, May 17, 2001 9:09 AM
> > Subject: Re: [PIC]: Simulating clicks of a mouse
> >
> >
> > > On Fri, 18 May 2001, Jinx wrote:
> > >
> > > > > I would like to build an interface between a mouse and a PC, using
> > > > > a PIC16F84, that could "simulate" clicks of the mouse
> (for an handi-
> > > > > capped person) My goal is to have a box with 2 big
> buttons, between
> > > > > the mouse and the PC.
> > > >
> > > > Does this help ? It's MS though, not PS/2
> > >
> > > I don't think there is a difference, other than the
> connector, port and
> > > IRQ used.  You can get DB9 <--> mini-DIN adapters and use
> either one on
> > > either type of port.
> > >
> > > Dale
> > > --
> > > A train stops at a train station.  A bus stops at a bus station.
> > > On my desk I have a workstation...
> > >
> > > --
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