V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ATAPI
       Advanced Technology Attachment Packet Interface (ATA)


The Free On-line Dictionary of Computing (30 December 2018):

AT Attachment Packet Interface
ATAPI

    (ATAPI) Part of the EIDE interface that provides
   additional commands to control a CD-ROM drive or magnetic
   tape.

   [Winn L. Rosch "The Winn L. Rosch Hardware Bible"
   (Third Edition), Sams Publishing, 1994].

   (1998-11-01)