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Typing 'DOS' at the DECB 'OK' prompt loads in track 34 off of the disk.
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Typing 'DOS' at the Disk Extended Color BASIC 'OK' prompt on a CoCo loads in track 34 off of the disk. Track 34 consists of 18 total 256 byte sectors; that's 4,608 bytes.  Here's what happens when 'DOS' is typed:
    
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Exception encountered, of type "Error"