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                                 emm_init

   Usage
   #include <emm.h>
   int emm_init(void);

   Description
   This  routine tests for the presence of the EMM driver as  recommended
   in the Expanded Memory Specification. The technique of tracing through
   the interrupt vector to find the name of the device driver is  adopted
   since it can be safely used by interrupt handlers and memory  resident
   software.

   Return Value
   Returns zero if an Expanded Memory Manager is installed or non-zero if
   one is not installed, or is not operating correctly.