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

[Tom Wiltshire]

Yeah, I thought that 8-to-3 chip was a clever touch too. It makes for a very simple implementation - nice work.

T.

On 31 Dec 2013, at 06:15, rsdio at sounds.wa.com wrote:

> The 74148 8-line to 3-line priority encoder chip in that P6Retro kit is even more handy for this task than the 8-input NAND that I was talking about. Not only can it trigger an interrupt input on your microcontroller (its EO line goes High and GS line goes low) when a column become active, but it will also decode the column number for you on the A[2:0] outputs. This makes for a very fast response to sync with the Casiotone matrix scan.
> 
> There's also a 74147 chip with 10 inputs that encodes to 4 bits, but doesn't support all 16 hex codes.
> 
> Brian Willoughby
> Sound Consulting
> 
> 
> On Dec 29, 2013, at 04:02, Roman Sowa wrote:
>> 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
> 
> 
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