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 Blinker real mode error handler
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 At runtime when a DOS real mode program linked with Blinker encounters an
 error condition, it passes an error number to the Blinker real mode error
 handler module. This routine supplies the text for the message which is to
 be displayed. The error handler is automatically included by Blinker in the
 .EXE in the course of linking.

 The source for the Blinker error handler is provided in the various
 language subdirectories of the Blinker directory, so the text of the Blinker
 error messages can be modified.

 If you modify the Blinker error handler, you must then compile it and link
 it as a FILE into the root of the program. If you do not modify it, there is
 no need to compile it or include it in the link script, as a default will
 automatically be included into the .EXE by Blinker.

 Care should be taken when overlaying the error handler in the case of the
 potential error 1201: "cannot find overlay file in the current path". This
 can cause an endless loop when the Blinker overlay manager cannot find an
 overlay file, tries to load the error handler, cannot find the overlay file
 containing the Blinker error handler, and again tries to load the error
 handler.

 The developer may wish to handle this particular error in a different way to
 avoid this problem, or may just ensure that the overlay file can be found,
 e.g. by making it an internal overlay.