API Specification 16D 2nd Ed. July 2004 Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment.pdf 9.976 MB

[link Point to another website Only the registered members can access]
Also here's the May 2011 manual for the InterLink 16D software (I do not have the software and can't answer any questions about it)

16D BOP Accumulator Sizing and Performance Tool - Program Version 1.04 - User Manual Companion Tool for API Specification 16D, Second Edition, July 2004 (May 2011).pdf 0.323 MB

[link Point to another website Only the registered members can access]