I have heard of people sanding the label side, bending the pins entirely
upside down, sanding the other side, and then placing it in the borad
upside down...

"Hmmm...  All the support circuitry for a PIC, but it doesn't have the
same pinout...  In fact, it seems almost reversed...!"

-Adam

Alan B. Pearce wrote:

>>What you WANT to do is what Hewlett Packard used to do before they were
>>seduced by the dark side and became like everyone else (and worse).
>>
>
>>-    Identify ALL components clearly
>>-    Provide detailed circuit diagrams with component lists
>>-    Provide detailed descriptions of circuit operation including what goes
>>on inside any special chips.
>>-    Publish free glossy technical journals describing in detail your
>>leading edge discoveries and research.
>>-    Sell at a price that seems high at first but is unbeatable by anyone
>>wanting to achieve equivalent functionality and quality.
>>
>
>I have an HP 7475A Plotter that was going to the rubbish heap. It was non
>functional, and the faulty chip had been identified by chip swapping with
>another working machine. HP would not sell us just the chip which was marked
>with their special part number. They wanted NZ$900 (around US$450) to send
>the complete plotter away to the USA for repair. This was obviously
>uneconomic so I said if they were going to throw it out they could throw it
>in my car. In due course I looked at the chip concerned and realised it was
>labelled 6805 on the bottom. Finding a 6805 micro in another piece of
>equipment I tried it in the plotter and voila! one working plotter - at no
>cost to me.
>
>Moral of the story is to check the underneath of chips when you have one
>with strange part numbers. Often they get stamped with a generic number as
>they come off the encapsulation line, I suspect before full functional test.
>The marking on the top does not occur until after full functional test.
>
>--
>http://www.piclist.com hint: The PICList is archived three different
>ways.  See http://www.piclist.com/#archives for details.
>
>
>
>
>

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