[sdiy] Top octave CPLDs are working!!!

[Ingo Debus]

Tim Ressel wrote:
> 
> Glen et al,
> 
> --- Glen <mclilith at ezwv.com> wrote:
> > Out of curiosity, how feasible would it be to make a
> > tiny circuit board
> > containing your two chips and actually use it to
> > replace a failed Mostek 50240?
> 
> Answer: no, and no. It would not be a tiny PCB, given
> the size of two 44-pin PLCCs. Even without sockets,
> were talking 2 square inches at least.

Hmm, maybe "upright", with one PLCC on either side? Glue a DIL socket or
DIL plug on one edge of the PCB.

> > I wonder if the voltage levels of your solution are
> > compatible with the old
> > chip?
> 
> As for voltage levels, the Mostek 50240 was rated for
> 11-16V. The CPLDs are 5V devices. So you're looking at
> level translators. The tiny board just even bigger.

Perhaps level translators are often not required. I suppose many organs
will use TTL for the dividers, so just the existing translators have to
be bypassed.

Ingo