NAME
        AllocMiscResource - allocate one of the miscelaneous resources

   SYNOPSIS
        CurrentUser = AllocMiscResource( unitNum, name )
        D0                               D0       A1

        char * AllocMiscResource(ULONG,char *);

   FUNCTION
        This routine attempts to allocate one of the miscellaneous resources
        If the resource had already been allocated, an error is returned. If
        you do get it, your name is associated with the resource (so a user
        can see who has it allocated).

        This function may not be called from interrupt code

   DESCRIPTION
        There are certain parts of the hardware that a multitasking- friendly
        program may need to take over.  The serial port is a good example. By
        grabbing the misc.resource for the serial port, the caller would
        "own" the hardware registers associated with that function.  Nobody
        else, including the system serial driver, is allowed to interfere.

        Resources are called in exactly the same manner as libraries.
        From assembly language, A6 must equal the resource base.  The
        offsets for the function are listed in the resources/misc.i
        include file (MR_ALLOCMISCRESOURCE for this function).

   INPUTS
        unitNum - the number of the resource you want to allocate
                  (eg.  MR_SERIALBITS).
        name - a mnenonic name that will help the user figure out
                what piece of software is hogging a resource.
                (havoc breaks out if a name of null is passed in...)

   RESULTS
        CurrentUser - if the resource is busy, then the name of
                the current user is returned.  If the resource is
                free, then null is returned.

   BUGS

   SEE ALSO
        resources/misc.i, freemiscresource()