[sdiy] NEC D936CT chip in my Muppet Babies keyboard

Peter Pearson electrocontinuo at gmail.com
Mon Jul 10 01:13:13 CEST 2023


On the Casio end of things, does anyone have a schematic for the Casio
QL-10 Calculighter?

https://www.calculator.org/calculators/Casio_QL-10.html

Saw something about it in a recent "Bad Gear" (no such thing) youtube
video.  I want one...

On Sun, Jul 9, 2023 at 6:50 PM Adam (synthDIY) <synthdiy at adambaby.com>
wrote:

> Robin Whittle did a lot of investigating in the 1980s with a related chip
> found in Casios. Some of this may be of help.
>
> [image: preview.png]
>
> Casio-931-2006-06-17
> <https://www.firstpr.com.au/rwi/casio/Casio-931-2006-06-17.txt>
> Text Document · 90 KB
> <https://www.firstpr.com.au/rwi/casio/Casio-931-2006-06-17.txt>
> <https://www.firstpr.com.au/rwi/casio/Casio-931-2006-06-17.txt>
>
>
> and some background here
> Modifications to Casio musical instruments from the 1980s
> <https://www.firstpr.com.au/rwi/casio/>
> firstpr.com.au <https://www.firstpr.com.au/rwi/casio/>
> <https://www.firstpr.com.au/rwi/casio/>
> <https://www.firstpr.com.au/rwi/casio/>
>
>
>
> A
>
>
>
>
>
> On 10 Jul 2023, at 4:51 am, Benjamin Tremblay via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> I cannot find any pinouts for this chip.
> I pulled if off the board (very carefully for me). Now I am trying to
> guess which io pins scanned the keys and switches.
> I can’t find a pinout for this chip anywhere. Octopart denies its
> existence.
> Not the same chip as the Casio VL and PT series monophonic keyboards, but
> hopefully somebody got a bonus for cramming the VL-10 functionality into
> this 28 pin DIP.
>
> Ben
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