Multipop-68 - significado y definición. Qué es Multipop-68
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Qué (quién) es Multipop-68 - definición

CANADIAN PUBLISHER
'68 Publishers; '68 publishers

Multipop-68      
<operating system> An early time-sharing operating system developed in Edinburgh by Robin Popplestone and others. It was inspired by MIT' Project MAC, via a "MiniMac" project which was aborted when it became obvious that {Elliot Brothers} Ltd. could not supply the necessary disk storage. Multipop was highly efficient in its use of machine resources to support symbolic programming, and effective - e.g. in supporting the development of the Boyer-Moore theorem prover and of Burstall and Darlington's transformation work. It was not good at supporting the user programs which were then the standard fare of computing, e.g. matrix inversion. This arose from the fact that while the POP-2 compiler generated good code for function call (which is a lot of what layered systems like operating systems do) it did not generate efficient code for arithmetic or store access, because there was no way to police the generation of illegal objects statically. (Hindley-Milner type checking did not exist). Indeed, since many OS features like file-access were performed by function-call (of a closure) rather than an OS call requiring a context switch, POP-2 actually gained performance. Multipop68 was efficient primarily because the one language, POP-2 served all purposes: it was the command language for the operating system as well as being the only available programming language. Thus there was no need to swap in compilers etc. All store management was accomplished uniformly by the garbage collector, as opposed to having store management for the OS and store management for each application. There was a substantial amount of assembly language in Multipop68. This was primarily for interrupt handling, and it is difficult to handle this without a real-time garbage-collector. [Edited from a posting by Robin Popplestone]. (1995-03-15)
AD 68         
YEAR
68 AD; 68 (year); Year 68; 68 CE; Events in 68; Births in 68; Deaths in 68
AD 68 (LXVIII) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Silius Italicus and Trachalus, or the start of the Year of the Four Emperors (or, less frequently, year 821 Ab urbe condita).
Japanese submarine Ro-68         
Ro-68
Ro-68 was an Imperial Japanese Navy Type L submarine of the L4 subclass. First commissioned in 1925, she served in the waters of Japan prior to World War II.

Wikipedia

68 Publishers

68 Publishers, also called Sixty-Eight Publishers, Sixtyeight Publishers, or even Nakladatelství 68 ('nakladatelství' is Czech for 'publishing house'), was a publishing house formed in Toronto, Ontario, Canada, in 1971 by Czech expatriate Josef Škvorecký and his wife Zdena Salivarová. The purpose of 68 Publishers was to publish books by Czech and Slovak writers whose works were banned in communist Czechoslovakia. The name '68 Publishers' is in commemoration of the Prague Spring of 1968.

Škvorecký and Salivarová began by publishing both Czech originals, and English translations, of Škvorecký's books. The first book, Tankový prapor (The Republic of Whores) was published in 1971 and was followed by others such as Prima sezóna (The Swell Season), Zbabělci (The Cowards), Konec nylonového věku (End of the Nylon Age). These were followed by the books of Czech and Slovak authors that were banned in Czechoslovakia, and therefore accessible only to the Czech and Slovak community in the United States, Canada, and elsewhere outside the communist bloc. From here the books traveled secretly to the communist homeland.

Many Czech and Slovak writers had their books published by 68 Publishers in the following two decades. Apart from Škvorecký and Salivarová themselves, they were: Bohumil Hrabal, Jan Křesadlo, Alan Levy, and Erazim Kohák. In 1981, 68 Publishers issued a book by Jaroslav Seifert (the only Czech writer to win a Nobel Prize in Literature), Všecky krásy světa (All the Beauties of the World). Expatriate Czech musician Karel Kryl had some albums released by 68 Publishers as well. Prior to 1989, 68 Publishers had published over 220 works of mostly original prose, poetry and memoir literature. Milan Kundera's novel The Unbearable Lightness of Being was first published in Czech through 68 Publishers in 1985, though it had already been published in France in 1984.