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Details of accessing the SCSI protocol?

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The Question is:

 
I've seen reference to the SYS$ETC:SCSI_INFO.EXE program in several of the
 answers related to getting information about SCSI devices.  Can the wizard
 reveal which API/System Service Calls are used to gather the information in
 that program?
 
Thanks

The Answer is :

 
  sys$qio.  For details on the low-level SCSI interface, on the GK generic
  driver, and on the sys$qio functions associated with this and with many
  other device driver operations on various devices, please see the I/O
  User's Reference Manual.
 
  For information on the SCSI commands used for accessing the SCSI mode
  pages and for a description of the contents of the mode pages, please
  see the SCSI protocol specifications.
 

  
     
     answer written or last revised on ( 20-JUL-2000 )
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