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From Wikipedia, the free encyclopedia

MOBIle DIgital Computer
Cutaway diagram of a MOBIDIC trailer
CodenameMOBIDIC
ManufacturerSylvania Electric Products
Product familyMOBIDIC
TypeMobile trailer computer
Release dateDecember 1959 (1959-12)
Introductory price$20-30 million USD
Discontinued1960s
MediaTape
CPU36 & 40 bit, 52 instruction
Memory2-7 banks of 4098 word core memory
StorageTape drives, punch tape
InputFlexowriter
ConnectivityOther MOBIDIC units
Power29.79kW, provided by generator van.
PlatformFieldata
DimensionsFour vans
Mass~7000lbs-12000lbs
Marketing targetAmerican Army, Government, Commercial (9400)
SuccessorSylvania 9400
LanguageCOBOL

Sylvania's MOBIDIC, short for "MOBIle DIgital Computer", was a transistorized computer intended to store, sort and route information as one part of the United States Army's Fieldata concept. Fieldata aimed to automate the distribution of battlefield data in any form, ensuring the delivery of reports to the proper recipients regardless of the physical form they were sent or received. MOBIDIC was mounted in the trailer of a semi-trailer truck, while a second supplied power, allowing it to be moved about the battlefield. The Army referred to the system as the AN/MYK-1, or AN/MYK-2 for the dual-CPU version, Sylvania later offered a commercial version as the S 9400.

YouTube Encyclopedic

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  • Introduction to Intellectual Property: Crash Course IP 1
  • Brian Greene and Barry Barish: World Science U Q+A Session
  • mobydick School - Telephone Setup [english]

Transcription

Hi, I'm Stan Muller. This is Crash Course and today we begin our miniseries on Intellectual Property Hey, isn't the entire concept of Intellectual Property illegitimate? I mean, how can we justify locking up the world of science and arts so corporations, publishing houses and other gatekeepers can control what we know and what we think! Information wants to be free, man! Hey, me from the past! There's a Stan from the past! This is great! Stan: Hey! Me from the past! There's a Stan from the past, this is great! Anyway. I can tell by looking at your vacant and bloodshot eyes that you've been up all night and I remember desperately trying to cling to any ethos that justified your rampant copyright infringement. That is if you ever participated in such activities. And even if you had participated in said infringing activities, the statute of limitations has likely run out. I don't even know what LimeWire is! I like how this is getting started, because Stan from the past raises some interesting points! There's a good chance that he, and a lot of you watching this video, might think about aspects of Intellectual Property as outdated and pretty much irrelevant. Maybe lots of you don't think of it at all! That line, "Information wants to be free", has been used to argue that current intellectual properly laws are outdated, over-broad and generally awful. The quotation is attributed to Stewart Brand and he said this to a group of computer programmers in 1984. "On the one hand Information wants to be expensive, because it's so valuable. The right information in the right place just changes your life. On the other hand, information wants to be free, because the cost of getting it out is getting lower and lower all the time. So you have these two fighting against each other." The full quote, which you hardly ever hear, actually spells out the major tension between intellectual property and technology quite well. And it did it more than 30 years ago, when the digital age was just beginning. As information technology becomes more and more pervasive and important in our day-to-day lives in the information society, information itself becomes exponentially more important and more valuable. Paradoxically, as our information technology improves, and as our computers and connections get better and faster, and sharing becomes easier, we're less able to control the copying and dissemination of this incredibly valuable information. The law of supply and demand pushes down the information's value. This tension is nothing new. Technology, especially in the context of copyright law, has always presented challenges. Socrates's and Plato's 'Phaedrus' bemoaned the advent of books, arguing that they "will implant forgetfulness in [human beings'] souls; they will cease to exercise memory because they rely on that which is written, calling things to remembrance no longer from within themselves, but by means of external marks." One way that humans have attempted to deal with these new technologies, with varying success, is by passing laws. The scourge of the piano roll was contemplated in the 1909 Copyright Act, the photocopier in 1976, and the Internet was covered in the 1998 Digital Millennium Copyright Act. But we're going to try to avoid this simplified intellectual property versus technology binary. The idea that we have to choose between devaluing the fruits of intellectual talent and labor, or devaluing the revolutionary information sharing capacity of our networks, is wrong-headed. The more interesting and more difficult question is how we can strike a balance; how we can incentivize and promote this revolution in the way we share information, while at the same time incentivizing and promoting the production of creative works and inventions by having respect for the human beings that actually created them. The difference between today's debates and those that took place 100 years ago is that intellectual property pervades our lives more and more every day. This is especially true for anyone viewing this video. I know that about 90% of you view Crash Course in a web browser, so consider the layers of IP in this very YouTube page. A lot of what you're looking at is covered by copyright. This video, for example, is covered as a motion picture work. The website itself is considered a literary work. The Thought Bubble, the theme song, and the video you watched right before this one, all have copyright protection. The software that streams the video is also a literary work. The web browser you're using is most likely registered as a computer program, as is the operating system. Lest you Linux weirdos think that you don't have a copyright on your OS: You do. You're just not enforcing it. Even your comments could be covered by copyright. That haiku you just posted: "Who is this person? What happened to Mr. Green? Dislike. Unsubscribe." That's copyright-able! When you agreed to this (image of YouTube user agreement), you granted YouTube a worldwide, perpetual, non-exclusive license to use your content in any way they see fit. There are also patents in play here. There's proprietary video streaming technology, and many of the components in your computer are patented. But wait! There's more! YouTube is a registered trademark, and if you saw an ad before this video, there was most likely a trademark in there. This is a trademark and under this sticker is an image of a piece of fruit, also a trademark. And behind the camera, our most precious and valuable mark, Mark Olsen. Mark Olsen, everybody! The search algorithm that got you here? That's a trade secret. My appearance in this video, and subsequent marketing of commemorative mugs with my likeness fixed on each one- that implicates my right of publicity. If you're watching this on an iPhone or an Android, there's a whole other world of copyrights and patents that apply. When you start to deconstruct it like this, it's dizzying. But despite all this complexity, most of the time the system moves along with a fluidity that sometimes makes it easy to put it out of your mind. Kind of like the internal functioning of your digestive tract. But it's there. Always there. Gurgling and churning and functioning. Did anybody order lunch? Now most of this fluidity and seamlessness is borne on the back of hundreds or thousands of lawsuits, many of them against Google, thousands of pages of intricately complex contracts, and hundreds of millions of take down notices. The point is that none of us, or very few of us, can go about our daily lives without being impacted by intellectual property. It's only when it hits home, like when you receive a cease-and-desist letter from a trademark attorney for opening a restaurant called Burger Queen, or digital rights management software stops you from listening to your iTunes downloads on your Zune. Maybe your YouTube video gets taken down because of that T-Swizzie song in the background (that's what the kids call Taylor Swift). Maybe you get a letter from your internet service provider, informing you that someone using your account has downloaded every episode of Game of Thrones and that if it keeps up you may be fined or imprisoned- or beheaded! That's when it flares up. Flare up! God, are we still on the digestive tract metaphor? Somebody get me a Tums. Tums, by the way, registered trademark of the GlaxoSmithKline group of companies. Most of us encounter IP only on its borders. We hear horror stories about the motion picture and recording industry suing grandmothers. We watch those unskippable FBI messages warning us about the consequences of copyright infringement, or we complain about paying thousands of dollars per pill for medicine. We tend to encounter intellectual property law in places where we, as users, are basically being told 'no'. And being told 'no' over and over again is irritating, especially when these "no's" don't seem to make any sense. And they're really irritating when they come with threats of fines or imprisonment. So in this course we're going to focus less on enforcement and the "no's" and more on the part of intellectual property that often says 'yes', 'sometimes', 'maybe', 'it is certain', or even 'ask again later'. I'm speaking, of course, of the "Liquid filled die agitator containing a die having raised indicia on the facets thereof", registered as patent US 3119621, which you might know as the Magic 8-Ball. Before we get too far, we should probably define intellectual property. This is going to get pretty abstract, so let's go to the Thought Bubble. The theoretical definition of intellectual property would begin by saying that it is: "Nonphysical property that stems from, is identified as, and whose value is based on an idea or some ideas." There has to be some element of novelty; the thing that we describe as intellectual property can't be commonplace, or generally known, in the society where it's created, at the time that it becomes property. You can't claim that you invented the wheel or that you wrote Moby Dick. Even though the source material for all IP is social -- the inputs are our education, our human interactions, and basically all the sensory data around us that we take in -- the thing that we call 'IP' is the product of us putting together all these social inputs into something that we're gonna call "the idea". "Only the concrete, tangible, or physical embodiments of the idea are protected by intellectual property law." The idea has to be fixed into a form and location in which humans have access to it. That could be a novel, or a logo, or a liquid filled die agitator containing a die having raised indicia on the facets thereof. Thanks, Thought Bubble. So in its purest and best form, IP is the propertization of intellectual effort and talent. In its most corrupt and worst form, intellectual property can be, and has been used by the propertied and powerful to protect concentrated markets and broken business models. At its very worst, it can be used a a censorship tool. Intellectual property differs somewhat from real property like cars or houses because it's limited in duration and scope. For example, copyrights last for the life of the author plus 70 years. Copyrighted works can be copied under the fair use exception for certain personal or publicly beneficial uses. Let's say a book reviewer quotes long passages of a novel, then pans the book. It's likely the author of the book wouldn't grant permission for this type of use. But we want to encourage informed public discourse. So there's a good chance it would be found to be a fair use. Patent laws carved out a limited experimental use exception that permits minimal use of a patent for amusement, to satisfy idle curiosity, or for strictly philosophical inquiry. Again, the patent owner probably wouldn't like this, but the law wants to encourage individual tinkering. Both these limitations exist to serve the primary objective of intellectual property: that's to promote the progress of science and useful arts by increasing our stock of knowledge. So in this series, we're going to focus on the 3 main branches of intellectual property: copyrights, patents, and trademarks. We won't have time to get into some of the lesser cousins of the family like trade secrets or the right of publicity, but all of these are included under the umbrella of intellectual property. So in the coming weeks we're going to try to get at some of the nuts and bolt of what intellectual property is, because like it or not, IP is only going to become more and more relevant as our lives become more and more digital. So regardless of what or how you feel about any aspect of IP, it's probably a good idea to have some basic knowledge of it. It doesn't matter if you're a consumer or a creator of protected content or both. Is understanding IP going to help you? You may rely on it. See you next week. Crash Course: Intellectual Property is filmed in the Chad and Stacey Emigholz here in sunny Indianapolis, Indiana, and it's made with the help of all of these nice workers for hire. If you'd like to help us make Crash Course in a monetary way that doesn't imply any ownership in the final work, you can subscribe at Patreon, a voluntary subscription service where you can support CrashCourse and help make it free for everyone forever. You can get great perks, but the greatest perk of all is the satisfaction of spreading knowledge. Right? So thanks for watching. We'll see you next week.

History

In early 1956 the Army Signal Corps at Fort Monmouth released a contract tender for the development of a van-mounted mobile computer as part of their Fieldata efforts. Fieldata envisioned a system where any sort of reports would be converted into text format and then sent electronically around an extended battlefield. At the recipient's end, it would be converted into an appropriate output, often on a line printer or similar device. By automating the process of routing the messages in the middle of the information flow, the Signal Corps was hoping to guarantee delivery and improve responsiveness. Fieldata can be thought of as a general purpose version of the system the US Air Force was developing in their SAGE system, which did the same task but limited to the field of information about aircraft locations and status.

The heart of Fieldata would be computer systems that would receive, store, prioritize and send the messages. The machines would have to be built using transistors in order to meet the size and power requirements, so in effect, the Army was paying to develop transistorized computers. In spite of this, most established players ignored the Army's calls for the small machine. Sylvania's director of development speculated that the Army's terminology in the contract may have hidden the apparent wonderful opportunity. In the end, RCA and Sylvania entered bids, along with a number of smaller companies with unproven track records. Sylvania's bid was the lower of the "big two", and they won the contract in September 1956.[1]

The first experimental machine, retroactively known as MOBIDIC A,[2] was delivered to Fort Monmouth in December 1959. By this time the Army had expressed increasing interest in the concept and had ordered four additional machines and associated software, including a COBOL compiler.[3] The original contract for the experimental machine was for $1.6 million, but the new developments increased the total to between $20 and $30 million.[4]

MOBIDIC B was supplied to the Army's Tactical Operations Center and featured dual CPUs for increased reliability.

MOBIDIC A/B weighed about 12,000 pounds (6.0 short tons; 5.4 t).[5]

MOBIDIC C was sent to Fort Huachuca as a software testing system. MOBIDIC D was ordered for the Army Security Agency in Europe, and MOBIDIC 7A was shipped to the 7th Army Stock Control Center in Zweibrücken, Germany.[6] 7A's service entry was delayed due to the failure of the Army-supplied tape drives, but Sylvania replaced these with off-the-shelf commercial units and the system went operational in January 1962,[7] the first off-shore deployment.

MOBIDIC C/D/7A weighed about 7,000 pounds (3.5 short tons; 3.2 t).[8]

The 7A unit was extremely successful in operation, cutting the time needed to order and deliver spare parts dramatically. Although Fieldata was developed for battlefield information, MOBIDIC was just as useful for other sorts of information as well, as the 7A machine demonstrated. It was so successful that the MOBIDIC D was diverted to the Army's 3922nd Ordnance Supply Control Agency in Orléans, France (Maison Fort) to replace the existing RAMAC 305 card system.[7]

By 1962, however, the Army had lost interest in Fieldata and canceled the project. The B machine was no longer needed for Fieldata software development, and in 1965 it was purchased by the National Bureau of Standards for software development and research.[9] The C, D, and 7A machines were later all moved to Karlsruhe, Germany, where they operated in the supply role for years.[7]

MOBIDIC's success, independent of Fieldata's failure, led to additional Army contracts for the smaller AN/APQ-32 computers, which processed artillery radar data. The basic layout of the MOBIDIC system was also used for the AN/ASD-1 computer used on the Boeing RC-135 ELINT aircraft, the PARADE and TIDEWATER projects, and its basic circuitry was used extensively in the development of the IBM 7090[dubious ] for the BMEWS systems.[4][10]

As Sylvania had hoped, commercial interest in a small, low-cost, robust computer system seemed widespread. MOBIDIC was adapted into the Sylvania 9400 that was marketed towards factory automation systems. Two systems were ordered, one by the Office of the Assistant Chief of Staff for Intelligence in the Pentagon, and another by General Telephone in California. However, as the costs of trying to compete in the commercial computer market became clear, Sylvania decided to withdraw from the market, and General Telephone canceled their order. Both 9400's were built; General Telephone's intended delivery was used by Sylvania internally.[11]

Description

Model on display in the Computer History Museum

MOBIDIC's design goal was the real time operation of its input/output system. A typical use for MOBIDIC would be to collate all the messages flowing through an input to different tape outputs based on a field in the data. The tapes could then be removed and the messages printed on an offline printer. For instance, a large supply depot might have numerous warehouses for different sorts of materials; MOBIDIC could route incoming requests by examining the part number and then sending that message to a particular tape. All of the output on that tape would then be printed and sent to the associated warehouse. MOBIDIC replaced many manual steps; it performed the collation lookup, sorting the data, and collecting all the printed messages for delivery.

MOBIDIC was a 36-bit binary machine, a common word size for early computers. The system used 36-bit data throughout, but stored it as 40-bit values to add additional sign and parity bits, and two spares.[12] This allowed it to store the full range from -(1 - 2−36) to +(1 - 2−36). Machines were normally equipped with two parallel banks of core memory with 4096 words each, but was expandable to seven banks maximum.[13] It could support up to 63 tape drives, punch tape input and output, as well as a Flexowriter. One connection could also be dedicated to sending data to another MOBIDIC system. The tape drives used one of the spare bits in the 40-bit word as a STOP indicator.

Most of the 52 instructions were in the one-address format, collecting into an accumulator, but a small number (load, move, etc.) were in two-address format. There were 15 arithmetic, eight transfer (memory), 17 logic, three sense and nine input-output instructions.[12] An add required 16 microseconds, a multiply or divide 86, these slow times a side effect of its serial operation.[13]

MOBIDIC's CPU and I/O systems were housed in a 30-foot (10 meters) van. The machine required 29.76 kW of power, which was supplied from a second, smaller, van containing a generator set. Two other vans contained auxiliary EAM equipment and a repair shop. All four vans were backed up; two to a side, to a raised wooden platform with steps on one end. One of the concepts being; since this was the Cold War era than in case of enemy attack, everything could be moved instead of having to be abandoned and destroyed.[14]

The dual-CPU MOBIDIC B (only one was produced) included three additional general instructions, as well as nine new instructions for supporting subroutines. The CPUs were independent but shared a single main memory consisting of 8,192 words of core. In a sample use, one of the CPUs would be used to import data, handing off data via shared memory to the second for output. Although the machine's speed was slower overall (adds were 42 μs), throughput could be greatly improved. If one of the machines failed, the program could be restarted on the remaining CPU, running both sides of the I/O task with reduced throughput.[15]

References

Notes

  1. ^ Sokol, pg. 2
  2. ^ "COMPUTERS AND DATA PROCESSORS, NORTH AMERICA: 13. Sylvania Electric Products, Inc., UDOFT and MOBIDIC, Waltham, Mass". Digital Computer Newsletter. 10 (1): 9–10. Jan 1958.
  3. ^ Sokol, pg. 3
  4. ^ a b Sokol, pg. 5
  5. ^ Weik, pp. 0651, 0654
  6. ^ "RUGGED, MOBILE, DIGITAL COMPUTER OFF TO U. S. 7TH ARMY IN WEST GERMANY" (PDF). Computers and Automation. 10 (2B): 2B. Feb 1961. Retrieved 2020-09-05.
  7. ^ a b c Sokol, pg. 4
  8. ^ Weik, p. 0657
  9. ^ Abrams
  10. ^ Sokol, pg. 7
  11. ^ Sokol, pg. 6
  12. ^ a b Weik, pg. 0650
  13. ^ a b Weik, pg. 0651
  14. ^ Weik, pg. 0652
  15. ^ Weik, pg. 0654

Bibliography

  • George Sokol, "MOBIDIC History", Sylvania, 4 September 1967
  • M.D. Abrams and R. Rosenthal, "On The Passing Of MOBIDIC-B", IEEE Computer, Volume 6 Issue 3 (March 1973), pg. 10–18. doi:10.1109/C-M.1973.217033
  • Martin Weik, [1][2], A Third Survey of Domestic Electronic Digital Computing Systems, Ballistic Research Laboratories, Report No. 1115, March 1961, pg. 0650-0657

Further reading

This page was last edited on 27 December 2023, at 07:08
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