>There is hardware for running an HP signature in the 9010a. I found this in
the
>service manual (page 4 of 4 of the main board schematic, or something like
that,
>there was no page number). Included in the calculation was a counter that
>counts the number of high to low transitions made by the incoming data
>bitstream.
>
Is this the Async clock module? (where you looking at the PDF from spies or
do yo have a schematic?)
>If this circuit is being used to calculate the sigs, it could be that this
count
>value is being added back into the calculation to convolute things. If
this is
>the case, the above solution won't work.
>
>This could be tested by, finding two identical signatures, using different
>bytes, that created the same CRC, and then adding a third byte to see if
they
>are both still equal.
>
2 identical signatures for the 9010A? we've got a collection of a paultry
few. I did run across one the otherday but I'm pretty confident it was a
typo.
Alex Yeckley are you reading?
Kev
Received on Wed May 08 17:54:23 2002
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