About: Flex machine

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The Flex Computer System was developed by Michael Foster and Ian Currie of Royal Signals and Radar Establishment (RSRE) in Malvern, England, during the late 1970s and 1980s. It used a tagged storage scheme to implement a capability architecture, and was designed for the safe and efficient implementation of strongly typed procedures. The hardware was custom and microprogrammable, with an operating system, (modular) compiler, editor, garbage collector and filing system all written in ALGOL 68RS.

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rdf:type	Thing yago:WikicatMainframeComputers yago:Artifact100021939 yago:Computer103082979 yago:Device103183080 yago:DigitalComputer103196324 yago:Instrumentality103575240 yago:Machine103699975 yago:Mainframe103711711 yago:Object100002684 yago:PhysicalEntity100001930 yago:Whole100003553
rdfs:label	Flex machine (en)
rdfs:comment	The Flex Computer System was developed by Michael Foster and Ian Currie of Royal Signals and Radar Establishment (RSRE) in Malvern, England, during the late 1970s and 1980s. It used a tagged storage scheme to implement a capability architecture, and was designed for the safe and efficient implementation of strongly typed procedures. The hardware was custom and microprogrammable, with an operating system, (modular) compiler, editor, garbage collector and filing system all written in ALGOL 68RS. (en)
differentFrom	FLEX (operating system) FlexOS
dcterms:subject	Malvern, Worcestershire Mainframe computers Computers designed in the United Kingdom Capability systems Science and technology in Worcestershire
Wikipage page ID	376748 (xsd:integer)
Wikipage revision ID	1097838092 (xsd:integer)
Link from a Wikipage to another Wikipage	Malvern, Worcestershire Microcode Garbage collection (computer science) Logica Royal Radar Establishment Automatic Computer ALGOL 68RS Activation record Malvern, Worcestershire Abstract data types PERQ PS-algol Remote procedure call International Computers Limited Mainframe computers Computers designed in the United Kingdom Capability systems Capability-based addressing Weak reference Ten15 Science and technology in Worcestershire Royal Signals and Radar Establishment
Link from a Wikipage to an external page	http://mca-ltd.com/martin/Ten15/introduction.html%3Ccite%3E
sameAs	Flex machine Flex machine Flex machine Flex machine
dbp:wikiPageUsesTemplate	dbt:Distinguish dbt:Other_uses dbt:Refbegin dbt:Refend dbt:Reflist dbt:Use_British_English dbt:Use_dmy_dates dbt:Object-capability_security
has abstract	The Flex Computer System was developed by Michael Foster and Ian Currie of Royal Signals and Radar Establishment (RSRE) in Malvern, England, during the late 1970s and 1980s. It used a tagged storage scheme to implement a capability architecture, and was designed for the safe and efficient implementation of strongly typed procedures. The hardware was custom and microprogrammable, with an operating system, (modular) compiler, editor, garbage collector and filing system all written in ALGOL 68RS. There were (at least) two incarnations of Flex, implemented using hardware with writable microcode. The first was supplied by Logica to an RSRE design, and the second used an ICL PERQ. The microcode alone was responsible for storage allocation, deallocation and garbage collection. This immediately precluded a whole class of errors arising from the misuse (deliberate or accidental) of pointers. A notable feature of Flex was the tagged, write-once filestore. This allowed arbitrary code and data structures to be written and retrieved transparently, without recourse to external encodings. Data could thus be passed safely from program to program. In a similar way, remote capabilities allowed data and procedures on other machines to be accessed over a network connection, again without the application program being involved in external encodings of data, parameters or result values. The whole scheme allowed abstract data types to be safely implemented, as data items and the procedures permitted to access them could be bound together, and the resulting capability passed freely around. The capability would grant access to the procedures, but could not be used in any way to obtain access to the data. Another notable feature of Flex was the notion of shaky pointers, more recently often called weak references, which points to blocks of memory that could be freed at the next garbage collection. This is used for example for cached disc blocks or a list of spare procedure work-spaces. COMFLEX, a packet switching network capable of transmitting data at magnetic-disc speed, was developed alongside Flex. It made feasible the use of remote file-stores, remote capabilities, and remote procedure calls. (en)
prov:wasDerivedFrom	wikipedia-en:Flex_machine?oldid=1097838092&ns=0
page length (characters) of wiki page	5688 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Flex_machine
is Link from a Wikipage to another Wikipage of	List of file systems List of operating systems Timeline of operating systems Plessey System 250 List of British computers Royal Radar Establishment Automatic Computer ALGOL 68 ALGOL 68RS PERQ PS-algol Flex CAP computer File system Capability-based addressing Capability-based security Ten15
is Wikipage disambiguates of	Flex
is foaf:primaryTopic of	wikipedia-en:Flex_machine

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