Analogue-sequencer

> I seem to have upgraded ok to v3.86 ok using MIDI-OX,
> but while sending the file the P3 display rapidly flashed
> alternatively:
> 
> BAD DATA!
> SEND MORE DATA (or something)
> 
> I panicked at first but all seems ok,
> is this behaviour during an upgrade normal?

The "BAD DATA!" display indicates that a code block received had a 
checksum error, so was not written to flash.
Given that most of the code stays the same between versions, this may 
not cause the failure of upgrade.
A final checksum is sent at the end of the sysex stream, which is 
used to verify the entire contents of the flash ROM.
So if you only get a BAD DATA on a block that *hasn't* changed 
between versions, the total checksum might still be correct, and the 
upgrade will work.

But generally, you should never see a BAD DATA! message.
A couple of cases of this have turned out to be problems with the 
MIDI input opto-isolator.
I'm going to look into this, and see if a change to the resistor 
values around the opto might be required - it could be that the 
current values are towards the edge of the ideal range and some parts 
might be out of tolerance enough to cause a problem.

Cheers,
Colin f

I seem to have upgraded ok to v3.86 ok using MIDI-OX,
but while sending the file the P3 display rapidly flashed
alternatively:

BAD DATA!
SEND MORE DATA (or something)

I panicked at first but all seems ok,
is this behaviour during an upgrade normal?

cheers..

Keith

http://home.freeuk.net/lowpass