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From: akcs.falco@hpcvbbs.UUCP (Andrey Dolgachev)
Newsgroups: comp.sys.handhelds
Subject: Re: ** NEED CRC FOR USE IN ASC->  help.
Keywords: crc
Message-ID: <277f9f82:1536.1comp.sys.handhelds;1@hpcvbbs.UUCP>
Date: 31 Dec 90 20:40:04 GMT
References: <277f5c07:1536comp.sys.handhelds@hpcvbbs.UUCP>
Lines: 2

the checksum can be generated by executing the HP command BYTES.  This
provides a checksum (4 nibbles) and I assume that you could just use
that.