[sdiy] NEC D936CT chip in my Muppet Babies keyboard

Adam (synthDIY) synthdiy at adambaby.com
Mon Jul 10 00:46:23 CEST 2023


Robin Whittle did a lot of investigating in the 1980s with a related chip found in Casios. Some of this may be of help.

https://www.firstpr.com.au/rwi/casio/Casio-931-2006-06-17.txt
Casio-931-2006-06-17
Text Document · 90 KB


and some background here
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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