Discussion about the Korg PolySix synthesizer

hello it's me again.

well so far it looks like it's quite possible that the main cpu is
faulty. the full label is
NEC PD8048c-345
i have a few questions:

does this microprocessor have internal PROM? if so - do we have a
binary for it? how would i go about programming it? anyone ever did
that?

any idea if it could still be available somewhere? any known substitute?

anyone got any of those spare? from a broken polysix maybe?

best regards,
jure

The 8048 is a factory mask-ROM device.  You ("you" being Korg in this 
case) sent a paper tape roll of the object code to mask into the device 
to Nec (or Intel) and they made a run of 3,000 or more parts for you.  
3,000 was the usual minimum quantity in those days.  The "-345" in the 
part number is probably the index number kept at the factory for which 
file is masked onto the part.

  That being said, there does exist the 8748 and 8749 CPUs, which are 
EPROM versions. You can still get unprogrammed ones from places like 
jameco.com.  It has to be programmed, which means you need a device 
programmer that can program 8748s/8749s.  The binary code file is also 
needed, which I have around here somewhere.  I have made KLM-367, 
KLM-366 and KLM-380 (Trident) CPUs in this manner.

Crow
/**/

jure zitnik wrote:

>hello it's me again.
>
>well so far it looks like it's quite possible that the main cpu is
>faulty. the full label is
>NEC PD8048c-345
>i have a few questions:
>
>does this microprocessor have internal PROM? if so - do we have a
>binary for it? how would i go about programming it? anyone ever did
>that?
>
>any idea if it could still be available somewhere? any known substitute?
>
>anyone got any of those spare? from a broken polysix maybe?
>
>best regards,
>jure
>
>
>
>
>
>PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
>Yahoo! Groups Links
>
>
>
> 
>
>
>  
>

Chris, how much do you sell the new KLM-367A compatible board for 
nowdays?



--- In PolySix@yahoogroups.com, The Old Crow <oldcrow@o...> wrote:
>
> 
>   The 8048 is a factory mask-ROM device.  You ("you" being Korg in 
this 
> case) sent a paper tape roll of the object code to mask into the 
device 
> to Nec (or Intel) and they made a run of 3,000 or more parts for 
you.  
> 3,000 was the usual minimum quantity in those days.  The "-345" in 
the 
> part number is probably the index number kept at the factory for 
which 
> file is masked onto the part.
> 
>   That being said, there does exist the 8748 and 8749 CPUs, which 
are 
> EPROM versions. You can still get unprogrammed ones from places 
like 
> jameco.com.  It has to be programmed, which means you need a device 
> programmer that can program 8748s/8749s.  The binary code file is 
also 
> needed, which I have around here somewhere.  I have made KLM-367, 
> KLM-366 and KLM-380 (Trident) CPUs in this manner.
> 
> Crow
> /**/
> 
> jure zitnik wrote:
> 
> >hello it's me again.
> >
> >well so far it looks like it's quite possible that the main cpu is
> >faulty. the full label is
> >NEC PD8048c-345
> >i have a few questions:
> >
> >does this microprocessor have internal PROM? if so - do we have a
> >binary for it? how would i go about programming it? anyone ever did
> >that?
> >
> >any idea if it could still be available somewhere? any known 
substitute?

> >
> >anyone got any of those spare? from a broken polysix maybe?
> >
> >best regards,
> >jure
> >
> >
> >
> >
> >
> >PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> >Yahoo! Groups Links
> >
> >
> >
> > 
> >
> >
> >  
> >
>

I do, email me.


--- In PolySix@yahoogroups.com, jure zitnik <kokoon@g...> wrote:
>
> hello it's me again.
> 
> well so far it looks like it's quite possible that the main cpu is
> faulty. the full label is
> NEC PD8048c-345
> i have a few questions:
> 
> does this microprocessor have internal PROM? if so - do we have a
> binary for it? how would i go about programming it? anyone ever did
> that?
> 
> any idea if it could still be available somewhere? any known 
substitute?

> 
> anyone got any of those spare? from a broken polysix maybe?
> 
> best regards,
> jure
>