The Application Binary Interface (ABI) defines the application interface to the B6700 Architecture and MCP.

The ABI describes the layout of  an executable codefile, how a codefile begins and ends execution, and how basic types can be created and destroyed.

These documents provide additional information and were used as references for this document.

• B6700 CodeFile Format. B6700/B7700 Technical Newsletter No. 106. 16th June 1975. Nick Smilonich, Burroughs UK
• B6700 Compiler-MCP I/O Interface. B6700/B7700 Technical Newsletter 113. July 31st 1975. Nick Smilonich, Burroughs UK.
• A-Series Compiler Interface & CodeFile Format. Michael B Smith, Burroughs CSC/East. Relative to MCP 3.6.
• UNISYS ClearPath HMP NX4800 and ClearPath A 2800 Level Delta Architecture Support Reference Manual. # 7012 6610-000 Unisys May1996. (Printed)
• UNISYS Libra Model 180 Architecture Support Reference Manual. # 6888 2141-000 January 2003. (CD-ROM)
• Computer Systems Organization, The B5700/B6700 Series. Elliott I Organick. Academic Press, 1973
• Stack Architecture.
• MCP 5.0 Symbol.
• Algol Compiler 5.0 Symbol.
• Binder 5.0 Symbol.

This document is divided into these sections:

• MCP Compiler Interface.
• Integrated Programming System.
• CodeFile Segment Zero.
• Minimum CodeFile Requirements. 
• Passing Parameters to Programs.
• Binder Information.
• Binder Universal Classes.
• Dynamic Code Compilation.
• Segment Dictionary.
• Code Segment Descriptors.
• Stack Building Code.
• Software Control Word.
• Intrinsics.
• Single Precision Operands.
• Double Precision Operands.
• Single Dimension Arrays.
• Multi Dimension Arrays.
• Long Arrays.
• Strings.
• String Arrays.
• Structure Block Type Descriptor.
• Structure Block Variables.
• Structure Block Arrays.
• Structure Block Reference.
• Structure Block Item Reference.
• Server Library.
• Server Library EntryPoint.
• Library Template and Library Directory.
• In Stack Arrays.
• On Fault.
• Epilog Procedure.
• Exception Procedure.
• Normal Try Statement.
• Value Arrays. 
• String Pool.
• Heap Vector.
• Limits.