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Messages to the driver

The communication between the program and the driver allows the driver to be called with special messages - and no object. The current list of obligatory messages the driver must respond to is as follows:

INIT

Driver initialisation. If the driver is installed before DSPACK initialisation - then another INIT call will be sent after DSPACK initialisation. The driver may check whether DSPACK has been initialised by calling integer function ids_done(ierr) - it returns 1 if DSPACK has been initialised and 0 otherwise.

LIST

Driver should write it's identification message on unit lun - used to list installed drivers.

IDENT

Identification request. pnt is a pointer to a character variable and the driver should copy it's name into that variable. This is the only mechanism available for the system to associate the class name with class number.