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From: billr@houxj.UUCP
Newsgroups: rec.music.synth,comp.sys.ibm.pc
Subject: midi porg help
Message-ID: <242@houxj.UUCP>
Date: Thu, 17-Sep-87 17:03:59 EDT
Article-I.D.: houxj.242
Posted: Thu Sep 17 17:03:59 1987
Date-Received: Sat, 19-Sep-87 10:28:42 EDT
Organization: AT&T Bell Laboratories, Holmdel
Lines: 43
Keywords: casio midi roland bug?
Xref: utgpu rec.music.synth:1313 comp.sys.ibm.pc:6907

I don't have complete detail here but a good
friend has been stuck on a midi bug for days
and i'm hoping someone can help.

Using a roland mpu401 to control a casio CZ1,
he is writing a patch editor etc. in 8086
assembly (yeah i know...) on an AT&T 6300.

Everything works ok so far but this:
bear with me here in case i munge terminology
(or spelling)

When sending a system exclusive message to 
UPLOAD patch information, he sends the
appropriate byte string (i think he said
7 of 'em) the casio should then sends a 
few bytes back to say go ahead...

He sends a bunch of bytes (256?) up to
the casio and the it should send 1 ack
byte back (hex F7). the problem is this..

He send those first 7 bytes and the casio
sends back , right away, those go ahead
bytes followed by the F7. Giving no
chance to upload the patch info bytes.

The odd part is that he wrote a basic 
program to do this section and it works
just fine but his assembly code does not.

It might just be a code bug but i doubt it
he's a competent assem programmer and has
go over the stuff many many time and even
tried a rewrite of that section but it 
behaves incorrectly also. Most likely
some timing problem but casio was of no
help. Any ideas, resources ect. he is stuck
at this point. thanks 

bill romanowski
AT&T Bell Labs
Holmdel, NJ