Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site cadvax
Path: utzoo!watmath!clyde!bonnie!akgua!sdcsvax!sdcrdcf!hplabs!hpda!fortune!amdcad!cae780!ubvax!megatest!cadvax!dtynan
From: dtynan@cadvax (Dermot Tynan)
Newsgroups: net.wanted.sources
Subject: CRC generation
Message-ID: <139@cadvax>
Date: Fri, 15-Mar-85 14:35:53 EST
Article-I.D.: cadvax.139
Posted: Fri Mar 15 14:35:53 1985
Date-Received: Mon, 25-Mar-85 02:16:52 EST
References: <186@tekcbi.UUCP>
Organization: Megatest Corp., San Jose, CA
Lines: 14

Can anyone supply me with a routine or algorithm for CRC (cyclical redundancy
checking) calculation??  I remember seeing a copy for a Z80 in public domain,
which used a combination of XORing and lookup tables, giving a high-speed
conversion.  Anything along those lines would be greatly appreciated.  The
particular CRC polynomial is for a floppy disk (X^12 + X^5 + X + 1), although
it would be preferred if the routine were general case so I could change it
for a different polynomial.  Either high-level or low-level software listing
would be acceptable, as I can convert it to what I need.  Please reply by mail
and I will post it to net.sources if there is sufficient interest.

	Thanks,
	- Der Tynan

dtynan@cadvax!megatest