Vintage Synth Repair

I think there is a great chnace you can still get it (I know these 
type of parts are still in use on some student projects etc.)


--- In vintagesynthrepair@yahoogroups.com, "John Brewer" <john@...> 
wrote:
>
> Is the 80c85 the cmos version of the 8085? if so they should still 
be
> around. Just a thought, if the address and data lines are changing, 
the CPU
> could be ok and it is an outside issue.
> John.
> 
> ----- Original Message -----
> From: "mark_r_abcd" <mark@...>
> To: <vintagesynthrepair@yahoogroups.com>
> Sent: Sunday, March 26, 2006 10:48 PM
> Subject: [vintagesynthrepair] 80C85 CPU - still current?
> 
> 
> >
> > Hi again all,
> >
> > You may remember I asked about a Korg Poly 800 with damage from
> > a leaking battery a few weeks ago. Well, the bicarb and toothbrush
> > technique has cleaned it up reasonably well, but there are other
> > problems now.
> >
> > The first is that the CPU seems to be faulty - on reset the 
address
> > and data lines, ALE and ~RD all pulse madly, but the ~WR line 
doesn't
> > do anything. After a short while, the lines go into a regular
> > pattern as if the CPU is in a fairly tight loop doing nothing.
> >
> > The CPU is an 80C85. Is this chip still in production or does
> > anyone know of a surplus outlet who'll sell a one-off at 
reasonable
> > cost?
> >
> > Cheers
> >
> > mark-r
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > --
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24/03/06
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> >
>