Vintage Synth Repair

You can find 8085 CPUs, but some are a little bit different so try to 
stay with the same brand and model number.

Jameco has a 80C85. You can try it if you want.


mark_r_abcd a \ufffdcrit :
>
> 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
>
>
>