[sdiy] Calculighter - was Re: NEC D936CT chip in my Muppet Babies keyboard

Florian Anwander fanwander at mnet-online.de
Mon Jul 10 09:30:19 CEST 2023


Many years ago I designed a pcb with a lot of 4066 to control the 
keyboard of my Korg MonoPoly - only to find out in the end, that I had 
inverted the order of the switch contacts of one side of the matrix. 
Playing a chromatic scale ended in 
g,f#,f,e,d#,d,c#,c,e,d#,d,c#,c,b,a#,a,g#,...


Am 10.07.23 um 02:09 schrieb Guy Taylor via Synth-diy:
> https://electronics.stackexchange.com/questions/376966/replacing-a-switch-matrix-with-diodes-with-a-analog-crosspoint-8x8-switch/376973#376973
>
>
>
> On Mon, Jul 10, 2023 at 10:09 AM Guy Taylor <geekon at gmail.com> wrote:
>
>     Hi Benjamin,
>     Here are docs about the 930 and 931. Sadly nothing on the 936.
>     I assume though the matrix scanning was probably done in a similar
>     way, so might be of some help
>
>     https://app.box.com/folder/31685718924?s=qux1xx8ct2dmr53koo9zig651spy7ef1
>
>     I was going to do a similar thing, and asked about on the stack
>     overflow, there were some suggestions on how to do it from Arduino:
>
>
>     On Mon, Jul 10, 2023 at 10:01 AM Benjamin Tremblay via Synth-diy
>     <synth-diy at synth-diy.org> wrote:
>
>         Several Asian warehouses claim to have uPD936CT mcus, but
>         nobody knew how it work. All I care is being able to scan the
>         matrix with some kind of Arduino. I’ll get it done.
>
>         Benjamin Tremblay
>
>>         On Jul 9, 2023, at 7:41 PM, Peter Pearson via Synth-diy
>>         <synth-diy at synth-diy.org> wrote:
>>
>>         
>>         I think that would've been a slider ruler with a lighter
>>         attached but yeah, strong agreement here.
>>
>>         On Sun, Jul 9, 2023 at 7:31 PM Adam (synthDIY)
>>         <synthdiy at adambaby.com> wrote:
>>
>>             Wow!
>>             NASA could have really used these back in 1969...
>>
>>             <GPN-2000-001313.jpeg>
>>
>>
>>>             On 10 Jul 2023, at 9:13 am, Peter Pearson
>>>             <electrocontinuo at gmail.com> wrote:
>>>
>>>             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.
>>>
>>>                 <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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>>>
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>>
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