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  #1  
Old 07-18-2010, 09:54 PM
dustin1234 dustin1234 is offline
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Default UMR with Yamaha Electone E-70 (1978)

Hello all,

Hoping for good new here, I've consulted schematics for my Electone E-70 from 1978.

It looks like it has 12 data lines (chromatic scale) and 4 select lines for the top 61 keys (and another 4 for the lower keyboard). I assume this means my UMR would not work with it.

I'm hoping someone says I am wrong or might suggest another way of accomplishing midi on this old and amazing beast.

I can post some scans of schematics and pcb images if it seems promising to anyone,

thanks in advance for any help!

-Dustin
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  #2  
Old 07-19-2010, 11:59 PM
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Hi Dustin,

If you can post the keyboard matrix schematic, that would be helpful--maybe I will be able to give a definite answer for you.
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Old 07-21-2010, 01:35 AM
dustin1234 dustin1234 is offline
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Sure John, thanks.


Here's a scan of the keyscan section. I'm not optimistic, but thanks for any help.

I'm up for any other suggestions as well. Name:  E70keyscanmatrix.jpg
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Old 07-23-2010, 02:55 PM
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My best initial guess is that the UMR won't be a good match for this. But I'm curious about your suggestion that the upper keyboard is a 12 data x 4 select matrix. What makes you say that?
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Old 07-23-2010, 05:20 PM
dustin1234 dustin1234 is offline
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I actually looked again after posting it, there are 5 select lines per keyboard.

The data lines are arranged in chromatic order, each with its own pin on the "keycoder" ic, as well as one more pin labeled CL (clock, I assume)
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Old 07-23-2010, 06:22 PM
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Ok. The current incarnation of the UMR only supports up to 8 data lines, so it wouldn't work well for this.

(You want the electone to accept MIDI input, right?)

Eventually I plan to update the UMR with some expanded functionality that might help with this, but I'm afraid it's behind several other items in "the project queue".
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Old 07-23-2010, 11:01 PM
dustin1234 dustin1234 is offline
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Thanks for clarifying John,

My UMR was intended for another keyboard anyways.

How about some sort of configuration of the MD24 kit? would that work?
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Old 07-24-2010, 10:42 AM
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Perhaps the MD24 perhaps could be made to work, but would require some added circuitry on each output. Plus, you'd need one MD24 for each 24 keys to be retrofitted.
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Old 07-24-2010, 10:12 PM
dustin1234 dustin1234 is offline
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Oh, so you're suggesting a 4066 ic switch for each key controlled by a digital output from the md24. That sounds less than ideal, I guess I am left to wait patiently for an updated UMR kit.

thanks very much for your help John, I look forward to the new model UMR, whenever that may be.

Dustin
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Old 10-21-2011, 02:31 PM
dustin1234 dustin1234 is offline
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Default new info from another forum

I saw some info on midifying the E-70 on another forum. Perhaps it can help toward finding this solution. I'm hoping there is a way to interface the keyscanning setup further down the line (ie. after key presses enter the first IC in the schematic shown)

"Hello,

it is not so complicated as asumed. There is a Digital Master Board inside the
shielded box on the right side of the organ. There you will find a clock, 4 data lines (key1-4) for keyboard information and a sync line. The information are coded and starts with the sync going high. The 4 data line are all high and the key code follows by 1 for the pedal, 7 for the upper and 7 for the lower keys. There are some additionell information for the register, but they seems to be changend from type to type."


I'm still really hoping to get midi going on this beast!
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