BOS and ROS were the operating systems (hereinafter “OS”) for Fujitsu’s medium general-purpose computers FACOM 230-25 and FACOM 230-35, and were announced in August 1968. BOS (Batch Operating System) was an OS designed mainly for medium-scale batch processing and was completed in June 1969. ROS (Real-time Operating System) was an OS designed mainly for real-time processing and was completed in December 1969.
In October 1971, BOS II, which achieved multiprocessing and provided an online control function called SOM (Standard Online Module) was completed as a higher-level OS beyond BOS.
In November 1974, BOS/VS, which realized virtual memory control, was completed as a successor OS to BOS. Incidentally, VS showed Virtual Storage and Storage meant memory.
The following describes the brief history of the OSs for Fujitsu’s medium general-purpose computer series FACOM 230-5 and FACOM 230-8, and the features of the OSs.
Fujitsu announced three models of the FACOM 230-5 series (FACOM 230-25/35/45) in August 1968. It also announced BOS and ROS as the OSs for FACOM 230-25 and 35 at the same time.
At that time, there was growing demand for real-time processing. However, in order to respond to that demand it was necessary for an OS to adopt a multitasking function, and many resources including memory were required. By contrast, for batch processing, it was preferable to downsize the system and minimize its price by imposing some limits. To achieve these goals, Fujitsu developed two types of OS: BOS designed mainly for batch processing as a medium-scale general-purpose OS, and ROS designed mainly for real-time processing.
In addition, in November 1971, Fujitsu also developed BOS II, a new OS that made it possible to execute batch processing and small-scale online processing simultaneously. BOS II also provided an online control function called SOM.
In August 1973, Fujitsu announced the medium-scale general-purpose OS BOS/VS, which supported virtual memory as the OS for FACOM 230-28 and FACOM 230-28S, which were lower models in the FACOM 230-8 series.
BOS/VS was succeeded by the medium-scale general-purpose OS OSIV/F2 for the M series.
|OS name||Features||Announcement date||Completion date|
|BOS||For medium-scale batch processing. Capable of simultaneously executing one batch process and up to two sub processes.||August 1968||June 1969|
|ROS||OS for small-to-medium scale real-time processing.||August 1968||December 1969|
|BOS II||Multiprocessing of up to 4 jobs||-||October 1971|
|BOS/VS||Virtual memory control||August 1973||November 1974|
BOS was a medium-scale general-purpose OS designed mainly for batch processing, and had the following features:
ROS was a medium-scale general-purpose OS designed mainly for small-to-medium scale real-time processing, and was completely different from BOS, which was developed in the same period. ROS had the following features, of which provision of an online common package called COP-F (online COmmon Package File oriented system) for building an online system was the most notable:
BOS II was a higher-level OS beyond BOS, developed with the aim of realizing small-scale online processing in parallel with medium-scale or large-scale batch processing. BOS II was operated on FACOM 230-35 and on FACOM 230-25, for which the memory was extended to 128 kilobytes. BOS II had the following functions, of which provision of SOM (Standard Online Module) was the most notable feature:
BOS/VS was a medium-scale general-purpose OS that was developed based on BOS in order to inherit the assets of BOS, and it realized virtual memory. BOS/VS was succeeded by medium-scale general-purpose OS OSIV/F2 for the M series. BOS/VS had the following features: