[sdiy] TB-303 cpu question

[Senso]

>Following on to my post re buying a cpu, I have a TR-606 cpu which 
>is the same as the 303 cpu apart from the mask rom, is there any way 
>I can modify it to work in the 303 (I'm half tempted to try it as is 
>to see what it does as is!) I wonder if it would be possible to get 
>the 606 cpu to address an external rom, I have no idea how or indeed 
>if it is possible, so any input welcomed!

I don't remember in which instruments, but I know that in some Roland 
machines you can switch from external eprom to the internal masked 
rom by disconnecting one pin.
One would expect the opposite to work as well.

Senso

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