Path: utzoo!attcan!uunet!mcsun!ukc!dcl-cs!aber-cs!cho
From: cho@aber-cs.UUCP (C.H. Orgill)
Newsgroups: comp.music
Subject: MIDI SysEx Checksums (esp. Casio equipment)
Message-ID: <2077@aber-cs.UUCP>
Date: 29 Oct 90 10:50:43 GMT
Reply-To: cho@uk.ac.aber.cs (Chris Orgill)
Organization: UCW,Aberystwyth,WALES,UK
Lines: 21


I am trying to write an Editor-Librarian on the Macintosh for a newly
acquired Casio VZ-1. Fine so far, but in the SysEx documentation Casio
omit to mention how their 7-bit checksum is generated. I can only
assume they allude to some commonly-known format for MIDI checksums.
Unfortunately, since this is my first programming experience of MIDI,
I do not know this format ! I can only report that it is not (the sum
of all the data bytes indicated) modulo 128. All clues gratefully
received !


(p.s. this will be either Public Domain or Shareware when it's finished,
if it's ever good enough !)

Regards,

Chris Orgill,				tel +44 970 622447
Research Associate,
Computer Science Department,		 cho%cs.aber.ac.uk@uunet.uu.net (ARPA)
University College of Wales,		 cho@uk.ac.aber.cs (JANET)
Aberystwyth, Dyfed, United Kingdom. SY23 3BZ.