[sdiy] keyboard interfaces

[harrybissell]

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?