[sdiy] pd650 - do all the Roland applicaitons use an identical chip?

[Senso]

>  > The 303, the 606, the 808 etc. etc. all list the pd650c as
>>  their (now unavailible) microprocessor.  Can these be
>>  interchanged between units, or are they specialised somehow
>>  for each individual application?
>
>These devices are mask programmed.
>The firmware is on a 'ROM' on the chip, so each CPU suits only the unit it
>is meant for.
>They have an extra number on the IC to indicate what mask it is programmed
>with.
>I don't think you can read the code out either...
>I got a spare 606 CPU from Rolan not too long ago.
>I don't think they have any 303 CPUs left anywhere.
>Never checked on the 808.
>
>Cheers,
>Colin f

Now all 650C's are EOL.
What's worse, it seems they have no backup of the firmware.
Last chip gone, firmware gone. And AFAIK that goes for all their 
programmed CPU's.

Senso

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