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

[Jack Jackson]

Looks like it would do the trick! I was thinking, you can pick up these Casiotone 'x0x' boards for around £30-50, usually in great condition because they're so unpopular. For that you get a metal/wood case with keybed and +/-15v and +5v psu. Could be pretty cheap and easy start point for SDIY.

Cheers,
Jack

Date: Sun, 29 Dec 2013 08:38:03 -0500
Subject: Re: [sdiy] How to add MIDI IN to an old Casiotone 101
From: theothergarypowell at gmail.com
To: jackdamery at hotmail.co.uk

I believe this would do it. 
http://store.highlyliquid.com/collections/midi-retrofits
On Dec 29, 2013 6:25 AM, "Jack Jackson" <jackdamery at hotmail.co.uk> wrote:

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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