Re: Gottlieb / Q*bert scripts for the 9010A/9100

I don't have a 9010a to verify the results, but I can write that fairly easily.

You left out a couple of things though.

What is the initial value of the CRC register (0000 or FFFF -- I assume it is 16
bits), and are the results inverted?

For example: CRC32 starts with an FFFFFFFF and inverts the results.

Starting with an FFFF allows leading zeros to be counted as part of the CRC, if
you start with 0000, leading zeros will be ignored. Inverting the results has
some advantages, but I don't remember what they were. But I guess it depends on
how the designers of the 9010a did things.

Ideally you can answer the above questions and give me a file, or two, with
known signatures, and I should be able to whip up a utility shortly.

-Zonn

BTW: It sure is a pain to respond to the list, I have to manually type
"ThechToolsList@flippers.com", shouldn't there be an easier way? :^)

On Mon, 06 May 2002 14:02:30 -0700, John Robertson <jrr@flippers.com> wrote:

>
>What we need is for some bright person to write a simple utility that
>converts data files to signatures. The signature formula is fairly simple
>and if combined with Bill Ung's ROMSUM would be a nice tool for our
>package. If you don't know ROMSUM it is a dos utility that will give a
>checksum listing plus the ROM size for a single or group of files...
>
>The Signature process is a CRC process that uses the following feedback
>equation: X(to the 16th) + X(to the 12th) + X(to the 9th) +X(to the 7th) +
>1 or
>P(X) = X(15th) + X(9th) + X(7th) +X(4th) + 1
>
>So who wants to make a simple (not for me!) binary program that allows one
>to input a file and outputs it's signature?
>
>John :-#)#
>
>At 09:11 AM 06/05/2002 -0400, Kev wrote:
>
>
>
>>Anyone written any test scripts for these or at the very least have some
>>checksum signatures?
>>
>>Thanks,
>>Kev
>
Received on Mon May 06 16:24:05 2002