[sdiy] Top octave CPLDs are working!!!

[Glen]

At 06:10 PM 4/6/02 , Tim Ressel wrote:
>Hey all,
>
>Score another point for productivity. I now have a
>pair of CPLDs that mimic the old Mostek 50240 TOG. 

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?
I wonder if the voltage levels of your solution are compatible with the old
chip?

Also, I suppose that you already know about the old TOS chips, which only
generated half the musical scale? A pair of them were required to generate the
whole 12-note scale, just as with your CPLD design. You might be able to design
a drop-in replacement module for some of these old "half-scale" TOS chips. Some
of them used odd voltages, and you would have to take that into account, but it
shouldn't be too hard.


Later,
Glen