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

Guy Taylor geekon at gmail.com
Mon Jul 10 02:09:51 CEST 2023


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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