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Circuitbenders Forum => Circuitbending discussion => Topic started by: mox folder on February 23, 2015, 06:31:41 PM

Title: Casiotone MT-21 [no rhythm]
Post by: mox folder on February 23, 2015, 06:31:41 PM

Hello and good day!
I have been exploring and designing new extensions on the rom chips inside this lil beasty, and this morning I turn it on to get busy...And to my surprise, there is no rhythm.
Would this be the internal clock?
I played around with some of the factory dials underneath the board itself. would I have made a short some-wheres?
This makes me a wee bit sad where it all matters, would any of you cats know a way I can repair the rhythm section?

 In advance, thanks heaps!

Title: Re: Casiotone MT-21 [no rhythm]
Post by: wax+wire on February 24, 2015, 07:13:22 AM

i'm not familiar with the MT-21, but if it is like an MT-45 all the accompaniment [drums, bass, arpeggios], all end up together].

do any accompaniment parts work?

Could you try creating a little audio finder setup - i get a tiny guitar amp, plug a cable in, put the wire ground to ground and probe around with the 'hot/signal' part of the cable to try and see if i get any sound.

Title: Re: Casiotone MT-21 [no rhythm]
Post by: iwillbeacircuitbender on August 02, 2015, 01:17:19 PM

No, I think that you have most likely erased the ROM in the NEC rhythm chip