1118: too many external overlays 
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  This message indicates that more than 15 unique external overlay file
  names were specified in the link script file. This version of Blinker
  only supports up to 15 external overlays.  It should be noted that with
  Blinker's dynamic overlaying, the only reason to have more than one
  external overlay file is so that each overlay file will fit onto a 360kb
  diskette, if required for distribution purposes.

  For a full description of external overlays see the command SECTION INTO
  in Chapter 6.