[sdiy] How to add MIDI IN to an old Casiotone 101

[Roman Sowa]

there are at least a few circuits to do exactly that, from CHD 
ELEKTROSERVIS or Kenton and many others.

this one is purely-DIY, in contrary to many commercial, ready to use kits:
http://www.angelfire.com/geek/srlabs/p6retro2.html

works wth 8x8 matrix, but you can customize it

Roman


W dniu 2013-12-29 12:23, Jack Jackson pisze:
> I have this old board, it's provides quite basic digital sounds from an NEC D990G chip. As far as I can tell, this chip also performs the matrix scanning of the keybed.
>
> So if one were to add MIDI to it, this is how I envisage it:
>
> 1. MIDI note-on message received
> 2. Microcontroller interprets note and uses a look-up table to tell it which position of the matrix this note fits.
> 3. Microcontroller waits until the switch for the notes row goes high
> 4. Microcontroller sends the correct pin high for that note.
> 5. Pin stays high until note-off is received.
>
> So the micro would have to sync (or at least follow) the onboard chips scanning and just output the 5v for that note at the correct time. 		 	   		
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