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|Keen 4-6 MSC0004.bin format:                                                              |
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* Seems to be roughly word-based throughout.
* 4 segments of two kinds, one $80 and $00 rich, the other just 'randomish' words.
* Segments of equal lenth in the pattern ABAB

    0 Segment 1, Looks RLE compressed, contains lots of $80s
 8000 Segment 2, Looks like a collection of words, -ve and +ve
16000 Segment 3, Consists of sections of $00 $xx and $80 $xx
24000 Segment 4, Looks like a collection of words; is divided almost evenly into two
                 sections of -ve and positive words seperated by 40 zero-value words