SYX file format
===============
The SYX file format packs every 7 8-bit bytes of a binary file 
into 8 7-bit bytes, which allows for a MIDI compatible file.
These files can be converted to true binary files using the
hd24syx2bin utility.

Once converted, the format seems to be as follows:

byte 0x00-0x07: string 'HD24CODE'
byte 0x08-0x0b: unknown (checksum?)
byte 0x0c-0x0f: version number string (e.g. "1.20")
byte 0x10-0x13: 32-bit word, value 0
byte 0x14-0x1b: Release date string (MM/DD/YY)
byte 0x1c-0x1f: 32-bit word, value 0
byte 0x20-0x27: Build time (hh:mm:ss)
byte 0x28-0x2b: 32-bit word, value 0
byte 0x2c-0x2f: binary file length in byte.
                for version 1.20, file length is
		712736 so bytes 0x2c-0x2f are
		0xae020 or 0x00, 0x0a, 0xe0, 0x20