Quite a while back, Ashley Roll, Dave Dribin and I were kicking around 
CRC16 implementations for a PIC. Just recently, Johan Bodin asked about 
the CRC algorithm for the Polynomial A001, which as he says, sounds an 
awful lot like the reversed 8005 polynomial. I didn't realize at the time 
he asked that it was indeed the reversed 8005 polynomial and hence the 
CRC16 algorithm.  So, I merrily went off and wrote a new optimized 
version. This one is only 23 instructions, which is 9 fewer than the 
previous version! It's isochronous, taking 23 cycles, and requires no 
tables.

Here's the routine:

http://www.dattalo.com/technical/software/pic/crc16.asm

Here are other CRC routines:

http://www.dattalo.com/technical/software/pic/crc.php

Scott
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