OldSynths

I just picked up an Ensoniq Mirage for parts and would like to see if 
I can coax some life out of it.  Everything appears dead.  Power 
supplies are good.  I'm trying to see if the processor appears 
functional.  I found one bent over pin and thought perhaps that was it 
but it is still dead.

I'm having trouble finding a datasheet for a 68B09 processor.  Does 
anyone know where one is posted?

The G- (pin 20) of the 2732 seems to follow the system clock (1MHz) 
which is screwy.  Anyone have a ecopy of the logic portion of this 
part of the schematic?  I'm starting to think the processor may be 
bad.  I don't want to invest in a full set of schematics since this 
whole unit may be junk.  I'd like to at least see if the processor is 
trying to read data from the eprom.

Dave

Check here for the datasheet

http://gamearchive.com/General/Data_Sheets/6809.pdf

The 6809 and 68B09 are compatible and both are
described in this document.

Eric

--- djbrow54 <davebr@...> wrote:

> I just picked up an Ensoniq Mirage for parts and
> would like to see if 
> I can coax some life out of it.  Everything appears
> dead.  Power 
> supplies are good.  I'm trying to see if the
> processor appears 
> functional.  I found one bent over pin and thought
> perhaps that was it 
> but it is still dead.
> 
> I'm having trouble finding a datasheet for a 68B09
> processor.  Does 
> anyone know where one is posted?
> 
> The G- (pin 20) of the 2732 seems to follow the
> system clock (1MHz) 
> which is screwy.  Anyone have a ecopy of the logic
> portion of this 
> part of the schematic?  I'm starting to think the
> processor may be 
> bad.  I don't want to invest in a full set of
> schematics since this 
> whole unit may be junk.  I'd like to at least see if
> the processor is 
> trying to read data from the eprom.
> 
> Dave
> 
> 
> 
> 


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