Ok,

True, i am using a priority encoder, and this prevents two people from
buzzing in at the same time.  However, since the loop to detect buzz-ins
is like 4 instructions long, the chances of two people buzzing in (with
a 10 mhz xtal) is very slim.  Either way, some method has to be used,
and i've looked at others, and this seems the most efficient... mostly
because it prevents 2 simultaneous buzzes with few chips

Greg

Dennis Plunkett wrote:
>
> At 21:44 15/07/99 -0400, you wrote:
> >What is the priority encoder chip part number?
> >
> >Greg Brault wrote:
> >>
> >> Wagner,
> >>
> >> First of all, I'm not about to have 10 SCRs lined up in a row for
> >> that... too much :)
> >> what happens in my code is that the 10 switches are encoded via a
> >> priority encoder.  this outputs a 4 bit code of any switch that is
> >> pressed. (16 possible...).
> >[snip]
> >
> >
>
> Yes I would like to know too, as this would at first glance seem to bit a
> bit biased to the person that is on the highest priority, unless of course
> you have some form of first press block, but then if both are at the same
> time (Effective) then the highest would win!
>
> Dennis