[sdiy] keyboard interfaces

[Bret Truchan]

I had some luck interfacing an atari keypad to my modular:

http://www.atarimuseum.com/computers/8BITS/400800/cx85.html

I had to decode the switches using a microcontroller though.  I never really 
finished that project.  Ha ha ha.  But it was working, I swear!

Cheers!
- Bret


>
>I'm not sure all of them handle n-key rollover correctly. As Eduardo
>pointed out, data entry is basically monophonic  (and he's right)
>
>H^) harry
>
>"Roy J. Tellason" wrote:
>
> > Since the subject of computer keyboards came up in here,  I thought I'd 
>toss
> > this out...
> >
> > Taking the small board found in a lot of those,  a little examination 
>shows
> > connector pins that went to the switch matrix that allowed for something 
>like
> > a 7x8 matrix,  or 128 possible keys?
> >
> > Junk keyboards are fairly easy to come by,  and it's not at all a big 
>deal to
> > remove the little board and toss the rest of it.  Particularly those 
>units
> > where the "switches" were mylar sheets with aluminum foil (?) "traces" 
>on
> > them.
> >
> > Seems to me that this would be a pretty easy way to interface a whole 
>mess of
> > switches,  if you've got something with a nontrivial digital component 
>in it
> > anyhow.
> >
> > Your thoughts on this?
>