These are cheap and possibly stackable:

<http://www.ebay.co.uk/sch/i.html?_trksid=3Dp2050601.m570.l1313.TR0.TRC0.Xp=
arallel+port+switch&_nkw=3Dparallel+port+switch&_sacat=3D0&_from=3DR40>

Djula

On 9.9.2013 6:59, YES NOPE9 wrote:
> I would like to A/B switch 50 digital signal lines with a mechanical swit=
ch.   Switch must be break before make.  Switch time can be several seconds=
..  Number of cycles will be less than 5000.  Does any product or design con=
cept exist ?
> Best
> Gus in Denver
>
--=20
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