[TenTec] CorsairII obsolescence - MCU copying

[Barry N1EU]

Are new 68705P3 chips available for programming even if you could dump
the data from a good Corsair II chip?

73, Barry N1EU

On Tue, Aug 2, 2011 at 4:21 AM, Steve Hunt <steve at karinya.net> wrote:
> Recently I've been idly thinking about how I might keep my CorsairIIs
> running in the event of failure of the MCU on the Logic Board. I realise
> the preferred approach might well be to replace most of the
> functionality with a modern PIC frequency-counter/display module.
> However, I was interested to come across a series of articles on the Web
> about how to extract data from a "good" 68705P3 and copy it into
> another. The technique is a bit time consuming - it involves forcing the
> reference MCU into the verification stage of a programming cycle,
> offering it all possible Hex values of every byte, and noting by
> differences of bus timing which byte verifies successfully. Sounds
> involved, but at least one guy has automated the process and produced a
> stand-alone 68705P3 copier:
>
> http://matthieu.benoit.free.fr/144.htm
>
> The programmer/copier also allows you to dump the reference contents
> from RAM to a PC; it would then be easy and fast to replicate the part.
>
> I wonder if anyone readers have tried something similar? I also wonder
> if it's worth asking the author if he would be prepared to use his
> copier to provide a dump of the contents of a CorsairII MCU?
>
> 73,
> Steve G3TXQ
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