[sdiy] PG200 controller - hacking?

[David D]

>I'm expecting a faulty Roland JX-3P to arrive sometime. It doesn't have the
>PG200 controller however, and assuming I get the synth itself working 
>again,
>I am toying with the idea of cloning the PG200. The hardware involved in 
>the
>PG200 looks very simple microprocessor-based project, but of course there 
>is
>the issue of finding out exactly what the protocol is that the '200 uses to
>communicate with the JX-3P. Of course, the service manual doesn't discuss
>any of this. Does anyone know much more about the PG200 and the control
>codes it transmits? Has anyone used a logic analyser to look at the codes 
>it
>exchanges with the synth when knobs / buttons are adjusted, and / or has
>already attempted to clone one?


  Trevor

I have thought of this but I havent put much more time into it than looking 
at the schemos/pcb artwork for the 200 and thinking "dam that looks like it 
would be easy"!
  I dont think you would really even need to know the logic levels if you 
just copied the schemos...for your personal education/enjoyment of 
course.....

  If you dont have the schemos let me know- I am always up for trading 
schemos.

  DavidD  StPaul MN

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