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Subject: Re: Decoding 800 Mk1 Cassette Data

From: "bereiden" <bereiden@...>
Date: 2012-08-29

Here is an update to the cassette data format:

byte    1:       0xB3 (I assume this is header info)
byte    2:       0xBF
byte    3:       0x00 (MIDI channel - 1)
bytes   4-259:   Sequence data
bytes 260-270:   Chord memory
bytes 271-290:   ??? (so far always 0xFF)
bytes 291-1634:  Patch data
byte 1635:       ??? (different between the factory dump and my Poly 800)
byte 1636:       Checksum (unsigned sum of bytes 3 through 1635)

The changes are identification of byte 3 as the MIDI channel, adding the chord memory region, and changing the checksum start from byte 4 to byte 3.

Note:  The chord memory ∗should∗ only need 8 bytes to save an 8-note chord, but there are 11 bytes reserved.  There may be some other information in that region that hasn't been identified yet.