Vintage Synth Repair

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
>
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