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data general eclipse wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 description toggle description subsection 1 1 initial models 1 2 later models 2 operating systems 3 facts 4 notes 5 references toggle references subsection 5 1 citations 5 2 bibliography toggle the table of contents data general eclipse 4 languages español 日本語 nederlands norsk bokmål edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia redirected from data general eclipse mv 16 bit minicomputer line 1974 1988 this article needs more citations please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources data general eclipse news newspapers books scholar jstor january 2017 learn how and when to remove this message eclipse data general eclipse s 130 front panel manufacturer data general product family nova operating system aos data general microeclipse microprocessor the data general eclipse line of computers by data general is a line of 16 bit minicomputers released in early 1974 and sold until 1988 the eclipse was based on many of the same concepts as the data general nova but included support for virtual memory and multitasking more suitable to the small office than the lab it was also packaged differently for this reason in a floor standing case the size of a small refrigerator the eclipse series was supplanted by the 32 bit data general eclipse mv 8000 in 1980 description edit the data general nova was intended to outperform the pdp 8 while being less expensive and in a similar fashion the eclipse was meant to compete against the larger pdp 11 computers the nova had a simple architecture with four 16 bit accumulator registers the latter two also serving as index registers the eclipse kept this layout and was compatible with nova code using them but added four 64 bit registers for floating point arithmetic support if installed like the nova the eclipse did not directly support byte addressing the smallest unit of addressable and writable memory is the 16 bit word a major improvement was the addition of a processor managed stack pointer which the nova lacked 1 the stack pointer was added into the later nova 3 machines in 1975 and also used on the later 32 bit data general eclipse mv 8000 the largest change to the programming model was the memory allocation and protection map system this broke down main memory into a series of 2 048 byte blocks and any one program could used up 32 of them for a total of 64 kb the maximum memory as a whole expanded from 64 to 256 kb but map made this change invisible to the programs to existing nova software nothing changed but for software written explicitly for the eclipse programs could share blocks of memory with other programs 2 this was a common architecture at the time for supporting timesharing which was a primary goal of the eclipse design initial models edit there were initially two series s and c and three individual models of the eclipse 100 200 and 300 the s 100 was the basic model lacking map and the floating point option both of which were present on the s 200 the c 300 added a collection of additional instructions to the s 200 intended to help implement common routines seen in business applications like converting strings between different character sets or reading and writing numbers to and from different formats including strings this commercial instruction set also included fixed point arithmetic instructions which were commonly used in currency calculations as they did not lose accuracy a to implement these the c 300 used a modified processor known as the extended arithmetic processor 2 another difference between the s and c series was that the former included a writable control store which allowed the user to write their own instructions and store them in the processor for fast execution 3 production problems with the eclipse led to a rash of lawsuits in the late 1970s after new versions of the machine were pre ordered by many dg customers and then never arrived 4 after over a year of waiting some decided to sue the company while others simply cancelled their orders and went elsewhere 4 it appeared that the eclipse was originally intended to replace the nova outright also evidenced by the fact that the nova 3 series released at the same time was phased out the next year however strong continuing demand resulted in the nova 4 perhaps as a result of the continuing problems with the eclipse later models edit as was the case with the earlier nova series the eclipse underwent continual updating following changes in semiconductor manufacturing unlike the nova these generally kept the name of the corresponding original model adding a model number such that for instance the s 100 was replaced by the s 130 and 140 5 the main differences in later models was the expansion of the memory model to allow for ever increasing amounts of main memory the s 140 supported up to 1 mb other changes included the addition of integer multiplication and division in the base unit as well as a version of the cis becoming standard on all models 6 operating systems edit the aos operating system was quite sophisticated advanced compared to the pdp 11 offerings with access control lists acls for file protection facts edit the original cray 1 system used an eclipse to act as a maintenance and control unit mcu it was configured with two ampex crts an 80 mb ampex disk drive a thermal printer and a 9 track tape drive its primary purpose was to download an image of either the cray operating system or customer engineering diagnostics at boot time once booted it acted as a status and control console via rdos station software notes edit the pdp 11 included an almost identical commercial instruction set cis as an optional add on references edit citations edit programmer 1974 p 1 1 1 2 programmer 1974 p 1 2 programmer 1974 p 1 3 1 2 kidder tracy 2000 1981 1 the soul of a new machine back bay books p 26 isbn 0 316 49197 7 s140 1979 s140 1979 p 1 3 bibliography edit programmer s reference manual eclipse line computers pdf data general 1974 programmer s reference series eclipse s 140 pdf data general 1979 v t e data general people edson de castro co founder steve wallach vernon weiss tom west edward zander computers minicomputers nova eclipse mv 8000 microcomputers and pcs micronova data general one walkabout servers aviion clariion software operating systems rdos aos aos vs ii dg ux applications business basic ceo programming languages b32 business basic extended basic dg l related data general corp v digital computer controls inc dg international the soul of a new machine the talking propellerheads retrieved from https en wikipedia org w index php title data_general_eclipse oldid 1378499948 categories minicomputers data general computers 16 bit computers computer related introductions in 1974 hidden categories articles with short description short description matches wikidata articles needing additional references from january 2017 all articles needing additional references this page was last edited on 4 october 2026 at 20 02 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree 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