About: Multi-Environment Real-Time

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Multi-Environment Real-Time (MERT), later renamed UNIX Real-Time (UNIX-RT), is a hybrid time-sharing and real-time operating system developed in the 1970s at Bell Labs for use in embedded minicomputers (especially PDP-11s). A version named Duplex Multi Environment Real Time (DMERT) was the operating system for the AT&T 3B20D telephone switching minicomputer, designed for high availability; DMERT was later renamed Unix RTR (Real-Time Reliable). The MERT operating system was a four-layer design, in decreasing order of protection:

Attributes	Values
rdf:type	Thing
rdfs:label	Multi-Environment Real-Time (en)
rdfs:comment	Multi-Environment Real-Time (MERT), later renamed UNIX Real-Time (UNIX-RT), is a hybrid time-sharing and real-time operating system developed in the 1970s at Bell Labs for use in embedded minicomputers (especially PDP-11s). A version named Duplex Multi Environment Real Time (DMERT) was the operating system for the AT&T 3B20D telephone switching minicomputer, designed for high availability; DMERT was later renamed Unix RTR (Real-Time Reliable). The MERT operating system was a four-layer design, in decreasing order of protection: (en)
differentFrom	Penn MERT
name	Multi-Environment Real-Time (en)
dcterms:subject	Bell Labs Unices Real-time operating systems Microkernel-based operating systems Microkernels
Wikipage page ID	1364232 (xsd:integer)
Wikipage revision ID	1089779721 (xsd:integer)
Link from a Wikipage to another Wikipage	Bellmac 32 Protection ring Message passing Minicomputer Bell Labs Unix Unix-like Unix shell Device driver Input/output Bell Labs Unices SPARC Application programming interface Lucent Kernel (operating system) Telephone switching Microkernel C (programming language) Alcatel-Lucent 3B series computers Real-time operating systems Database PDP-11 Paging Real-time computing Real-time operating system Hardware interrupt Interprocess communication Microkernel-based operating systems Microkernels THE multiprogramming system CP-67 Solaris (operating system) File system RC 4000 multiprogramming system RSX-11 System call Extent (file systems) Shared memory X.25 Time-sharing Inodes 5ESS Embedded computing 3B20D 3B21D High availability computing
sameAs	Multi-Environment Real-Time Multi-Environment Real-Time Multi-Environment Real-Time Multi-Environment Real-Time
working state	UNIX-RTR/3B21D version still in use. (en)
dbp:wikiPageUsesTemplate	dbt:Real-time_operating_systems dbt:Distinguish dbt:Infobox_OS dbt:Reflist dbt:Short_description dbt:Microkernel dbt:Bell_Unix
developer	Bell Labs
family	Unix-like
kernel type	Microkernel Real-time operating system
language	English (en)
supported platforms	PDP-11 3B20D 3B21D
has abstract	Multi-Environment Real-Time (MERT), later renamed UNIX Real-Time (UNIX-RT), is a hybrid time-sharing and real-time operating system developed in the 1970s at Bell Labs for use in embedded minicomputers (especially PDP-11s). A version named Duplex Multi Environment Real Time (DMERT) was the operating system for the AT&T 3B20D telephone switching minicomputer, designed for high availability; DMERT was later renamed Unix RTR (Real-Time Reliable). A generalization of Bell Labs' time-sharing operating system Unix,MERT featured a redesigned, modular kernel that was able to run Unix programs and privileged real-time computing processes. These processes' data structures were isolated from other processes with message passing being the preferred form of interprocess communication (IPC), although shared memory was also implemented. MERT also had a custom file system with special support for large, contiguous, statically sized files, as used in real-time database applications. The design of MERT was influenced by Dijkstra's THE, Hansen's Monitor, and IBM's CP-67. The MERT operating system was a four-layer design, in decreasing order of protection: * Kernel: resource allocation of memory, CPU time and interrupts * Kernel-mode processes including input/output (I/O) device drivers, file manager, swap manager, root process that connects the file manager to the disk (usually combined with the swap manager) * Operating system supervisor * User processes The standard supervisor was MERT/UNIX, a Unix emulator with an extended system call interface and shell that enabled the use of MERT's custom IPC mechanisms, although an RSX-11 emulator also existed. (en)
marketing target	Real-time computing applications (en)
programmed in	C (programming language)
gold:hypernym	System
dbp:wordnet_type	http://www.w3.org/2006/03/wn/wn20/instances/synset-operating_system-noun-1
prov:wasDerivedFrom	wikipedia-en:Multi-Environment_Real-Time?oldid=1089779721&ns=0
page length (characters) of wiki page	12503 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Multi-Environment_Real-Time
is Link from a Wikipage to another Wikipage of	Mert Version 6 Unix RTLinux Mach (kernel) Comparison of real-time operating systems Microkernel UNIX System III PDP-11 Unix RTR DMERT Research Unix UNIX-RTR MERT MERT (operating system)

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