| gptkbp:instanceOf | gptkb:mainframe_computer 
 | 
                        
                            
                                | gptkbp:architecture | stack machine 
 | 
                        
                            
                                | gptkbp:designedFor | business data processing 
 | 
                        
                            
                                | gptkbp:influenced | ALGOL-based systems stack machine architectures
 
 | 
                        
                            
                                | gptkbp:introduced | 1961 
 | 
                        
                            
                                | gptkbp:language | gptkb:COBOL gptkb:ALGOL
 gptkb:BASIC
 gptkb:FORTRAN
 Assembler (internal use only)
 
 | 
                        
                            
                                | gptkbp:length | 48 bits 
 | 
                        
                            
                                | gptkbp:manufacturer | gptkb:Burroughs_Corporation 
 | 
                        
                            
                                | gptkbp:marketedIn | gptkb:Europe gptkb:United_States
 
 | 
                        
                            
                                | gptkbp:memoryProtection | hardware-enforced 
 | 
                        
                            
                                | gptkbp:notableFor | tagged architecture hardware-enforced security
 stack-based architecture
 descriptor-based memory management
 hardware support for high-level languages
 influenced later Burroughs large systems
 early virtual memory features
 influenced Unisys ClearPath MCP systems
 no assembly language exposed to users
 no user-accessible machine code
 object-oriented features (precursors)
 separation of data and program stacks
 support for recursive procedures
 support for reentrant code
 
 | 
                        
                            
                                | gptkbp:operatingSystem | gptkb:MCP_(Master_Control_Program) 
 | 
                        
                            
                                | gptkbp:successor | gptkb:Burroughs_B5700 gptkb:Burroughs_B5500
 gptkb:Burroughs_B6500
 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Burroughs_D100000000 gptkb:Burroughs_D1000000000
 gptkb:Burroughs_D10000000000
 gptkb:Burroughs_D1000000000000
 gptkb:Burroughs_D6000
 gptkb:Burroughs_D600000
 gptkb:Burroughs_D6000000
 gptkb:Burroughs_D900
 
 | 
                        
                            
                                | gptkbp:bfsLayer | 7 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Burroughs B5000 series 
 |