[Coco] Fwd: IP packets on my coco
dave at davebiz.com
Wed Jun 8 01:27:51 EDT 2016
I remember from the CRC calculation in X/Ymodem that there is an easy
and faster way to get the CRC using lookup tables. That's how I did it
with Supercomm. I believe the CRC for the networking packets is a
32-bit CRC so I don't know if lookup tables are still practical or not
with that size CRC. What is amazing is that I was able to find that
information without the internet back then. I just now did a few
cursory searches on calculating CRCs and I'm guessing that there is a
fairly easy method that doesn't require so much overhead.
On 6/7/2016 10:39 PM, Brett Gordon wrote:
> Nice! I found that the fun part about CRC specs... they are usually
> imcomplete. They might tell you a polynomial. but they seem to forget to
> tell you all the minutiae.
> Brett M Gordon
> On Jun 7, 2016 10:12 PM, "Barry Nelson" <barry.nelson at amobiledevice.com>
>> I don't know about getting the chip to compute the CRCs, but I have some
>> old 6809 assembly code I developed to computer CRCs for Xmodem CRC. It's in
>> the XCOM9 source code. I don't know how useful it will be.
>>> Brett Gordon beretta42 at gmail.com
>>> Tue Jun 7 18:56:07 EDT 2016
>>> Hah...answered my own question..these chips take layer 2 ethernet
>>> not too horrible to program for but....computing the CRC in the coco is
>>> slow and painfull. Does one of these chips do the for us?
>> Coco mailing list
>> Coco at maltedmedia.com
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