Genealogy of OSs for Fujitsu Mainframes

Loader, IOCS MCP I MCP II MCP III BOS ROS BOSII BOS/VS OSIV/F2 OSIV/ESP V2 OSIV/ESPIII OS 45 OS45 renamed OSII OSII/VS OSIV/X8 OSIV/X8 FSP OSIV/XSP MONITOR II MONITOR III/IV MONITOR V MONITOR VI/VII OSIV/F4 OSIV/F4 MSP OSIV/MSP(MSP-EX) AVM AVM/EF AVM/EX UTS/M UXP/M