Forgot your password?
typodupeerror

Comment: Re:The Psychology of Computer Programming (Score 1) 247

by TwobyTwo (#46838163) Attached to: Ask Slashdot: Books for a Comp Sci Graduate Student?
My, I thought I was about the last person around who remembered Weinberg's book, but I see he's republished it. A group I worked with in 1976 used it to guide our approach to building teams and to "egoless programming". As i recall, most ot the examples are from the punch card era, but the reviews on Amazon say that Weinberg's updated it with comments based on experiences in the decades since. That said, I think it's a stretch to recommend the Psychology of Computer Programming as "Computer Science". It's an interesting exploration of the social dynamics of building good programming teams, but as I recall it has little to do with computer science.

Comment: Re:what do others use? (Score 3, Informative) 299

by TwobyTwo (#46088249) Attached to: Ask Slashdot: An Open Source PC Music Studio?
I agree: REAPER may or may not be quite what you're looking for, and it's not open source, but it's got a free distribution for experimental use and the fee for purchasing it for anything other than larger-scale use will be a small fraction of what you pay for that PC anyway. Surprisingly capable for the price.

Comment: The IBM 1620 at the Bronx HS of Science (Score 1) 623

by TwobyTwo (#43851157) Attached to: How Did You Learn How To Program?

By the late 1960s, the US panic over Russia's launch of Sputnik had resulted in a significant increase in investment in science education at all levels. In particular, an experimental program was started at the public Bronx High School of Science in New York City, with the goal of exploring whether high school age students could successfully program computers. (Computers often cost hundreds of thousands or millions of dollars, so this felt a bit like seeing whether students could fly a jetlineer). The school procured a number of small systems including several of the legendary Olivetti Programma 101s.

The school's main machine, though, was an IBM 1620. It was a decimal (not binary) machine, and the high school's was had the minimum 20K digits (not bytes!) of memory. Originally, input and output was only via punch cards and the built in typewriter, but by 1968 or 1969 an IBM 1311 disk drive, which was itself the size of a small washing machine, added 2 Million digits of persistent storage, and a 1443 lineprinter was also added.

Students were taught, in this order: machine language, then FORTRAN II, then assembler. That's not a typo. Since the machine was decimal, it wasn't too hard to type in raw machine code onto cards, which could be loaded directly into memory by a short self-booting loader program, which was included on the front of each card deck. There was an assember, but until the hard disk showed up the assembler required that an intermediate deck be punched and loaded each time an assembly was attempted. So, for moderate size programs, it was often easier to write machine code directly. This typically involved manually computing and setting the absolute target of each branch. Here's a picture of the cover of the textbook that students used to learn 1620 programming.

This experiment was, in my opinion, wildly successful. I'm aware of at least 4 quite well known computer scientists who started their programming careers in the 1960s on that machine at Bronx Science. In general, many programmers from that era learned on 1620s. Like PDP-11s and Apple-2's later, 1620s were machines that an individual could get easy access to, and could learn to program at both a low level (machine or assember) and higher level (FORTRAN, LISP). Famously, the 1620 did not have a general purpose adder implemented in hardware: the add instructions would not produce the usual results until software loaded a table of partial sums into a fixed location in memory. The machine's nickname was thus CADET: Can't Add, Doesn't Even Try.

Comment: Richly deserved recognition for Capt. Jerr Roberts (Score 5, Interesting) 57

by TwobyTwo (#42422067) Attached to: Bletchley Park Codebreaker Honored
I have had the great pleasure of corresponding with Captain Roberts over the past couple of years. Not only did he and his team make an extraordinary contribution to winning WWW II, he has worked tirelessly since the declassification of the Tunny work to get recognition for the many others who contributed heroically and anonymously. It's quite amazing to talk with someone who had the experience of decrypting Adolph Hitler's personal communications, hours after they were sent. Note that most of the work done by Capt. Roberts and his team was done by hand. Colossus eventually helped with some steps, but not at first, and even then many steps remained to be done manually. At 92 Capt. Roberts remains very engaged and passionate about the work done at Bletchley. If there's a concern, it's that he should have been recognized for his work then, as well as for his recent publicity efforts, and one can make the case that MBE doesn't nearly recognize the magnitude of his contribution. Congratulations, Jerry!

Comment: Um, Nate Silver's own Nov. 4 estimate is 86.3% (Score 4, Informative) 881

by TwobyTwo (#41881085) Attached to: Nate Silver's Numbers Indicate Probable Obama Win, World Agrees

According to today's actual posting from Nate Silver, the same data leads him to conclude an 86.3% chance of an Obama win in the electoral college. Still high, but your "Nate Silver's Numbers Project..." headline is true if parsed carefully, but very misleading. If you want to say "I conclude from Nate Silver's numbers...", well fine.

Silver's Nov. 4 post is at: http://fivethirtyeight.blogs.nytimes.com/2012/11/05/nov-4-did-hurricane-sandy-blow-romney-off-course/ (paywall :-( )

Comment: Another rumor on MIT students and Apollo (Score 4, Interesting) 258

by TwobyTwo (#40895287) Attached to: Did an Unnamed MIT Student Save Apollo 13?

For what it's worth, I was a student at MIT in the early 1970s. I recall in the summer of 1972 hearing a story from other students that is surprisingly similar in general outline, but not in detail. Obviously, my memory from so long ago isn't perfect, what I heard at the time was a rumor anyway, and I haven't really tried to research anything that would corroborate it. That said...

The story was not about Apollo 13, but about another Apollo mission that had established orbit around the moon. Some sort of faulty sensor reading or stuck switch was preventing the system from preparing the necessary rocket firings to break the astronauts out of lunar orbit and send them home. According to these rumors, NASA identified the author of the control code as an MIT student working at the Charles Stark Draper laboratory, which is affiliated with MIT. An emergency call went out to find him, so that he could patch the code to ignore the faulty switch or sensor.

The claim is that the call was taken by friends, who were concerned by the fact that the student in question, whether long-haired or not, was either drunk or stoned out of his gourd at the time. Nonetheless, the student was alerted. He supposedly uttered the obvious "oh !$!$!" and stumbled off to Draper Lab, where in his reduced condition he patched the code and saved the astronauts.

Very much a rumor/urban legend, but suspiciously similar to the new story about Apollo 13. These certainly were the sorts of stories that floated around MIT at the time. I expect that at least a small percentage of them are true.

Comment: Re:Al Gore (Score 3, Informative) 257

by TwobyTwo (#40749707) Attached to: Correcting the Record: the Government's Role In the Internet
If you actually care, check the facts. Those who did invent the Internet give Al Gore a whole lot of credit. Seriously:

http://web.eecs.umich.edu/~fessler/misc/funny/gore,net.txt

Describing his role as congressman, Vint Cerf and Bob Kahn, who played key roles in the development of the Internet and TCP/IP write:

"He was the first elected official to grasp the potential of computer communications to have a broader impact than just improving the conduct of science and scholarship. Though easily forgotten, now, at the time this was an unproven and controversial concept. Our work on the Internet started in 1973 and was based on even earlier work that took place in the mid-late 1960s. But the Internet, as we know it today, was not deployed until 1983. When the Internet was still in the early stages of its deployment, Congressman Gore provided intellectual leadership by helping create the vision of the potential benefits of high speed computing and communication. As an example, he sponsored hearings on how advanced technologies might be put to use in areas like coordinating the response of government agencies to natural disasters and other crises."

They go on to discuss the important contributions he made as Senator and Vice President.

Government

+ - Correcting the record: The Government's Role in the Internet->

Submitted by TwobyTwo
TwobyTwo (588727) writes "Yesterday, jaymzter posted a Slashdot piece titled Who Really Invented the Internet? . It quoted a Wall Street Journal article with the same title by Gordon Crovitz. Crovitz makes the claim that government research did not play a key role in driving the invention of the Internet, giving credit instead to Xerox PARC

Unfortunately, Crovitz' article is wrong on many specific points, and he's also wrong in his key conclusion about the government's role. In a wonderful piece in the LA Times Michael Hiltzik corrects the record. Hiltzik, who is the author of an excellent book about PARC called Dealers of Lightning, makes clear that government funded research was indeed the foundation for the Internet's success."

Link to Original Source
Apple

+ - German court imposes Europe wide Samsung Galaxy Tab 7.7 ban->

Submitted by hypnosec
hypnosec (2231454) writes "Samsung it seems is on a losing spree as in a fresh ruling a German court has upheld Apple’s claim of ban on Galaxy Tab to the point that it has also granted Cupertino a Europe wide ban Galaxy Tab 7.7 for infringing upon iPad’s design patents. The court has however allowed the Galaxy Tab 10.1N to remain on sale. The Dusseldorf Regional Court ruled that Apple can go ahead and seek a preliminary ban on the Galaxy S III maker’s 7.7-inch tablet. The court went a step ahead though and said that the tablet won’t be banned just in Germany but it will be removed from store shelves across the whole of Europe. The news didn’t turn out to be all sweet for Apple as the court has denied a ban on the re-designed Galaxy Tab 10.1N."
Link to Original Source

+ - Question /.: Is DOD Enabling Agile IT Modernization Viable or Vapor Value?->

Submitted by
OldHawk777
OldHawk777 writes "DOD C*O MODERNIZATION ENABLING AGILE, SECURE, EFFICIENT, AND EFFECTIVE DOD IT http://dodcio.defense.gov/, http://www.afei.org/ [from the outside looking in ...]

DOD CIO Teri Takai, "Information is our greatest strategic asset." [Really] I strongly agree with this view. However, IMO, there is a growing fixation across government that IT/infrastructure (LAN, WAN, Virtualization, Cloud, Data-Warehouse ...) architectures and solutions will provide NetCentric Information Management. IMO, there are many plans to build across enterprises monolithic stovepipe/rice-bowl proprietary systems with costly lifecycles, high risk, and very little "agility." Yes, I could be wrong; So, ask /. community ... what are you seeing in DOD, USAF, USMC ... EU/NATO.

The Department of Defense Information Enterprise Architecture http://dodcio.defense.gov/Portals/0/Documents/DIEA/DoD_IEA_v1_2_7_May_2010.pdf, Appendix B: DoD IEA Hierarchical Activity Model; A.1, "Provide Data and Services Deployment." IMO, does address NetCentric IM architecture requirements, but .Gov/.Mil mid-management remains fixated on IT models as the only "Agile" mission requirement.

Is an "Agile" ("Open" or "Closed") IM or IT architecture more essential to reduced risk, cost control, and building a GIG and NetCentric environment? Any other comments ...."

Link to Original Source

Comment: A mishmash of half-truths over-simplifications (Score 3, Informative) 497

by TwobyTwo (#40740577) Attached to: Who Really Invented the Internet?

There's a lot of merit in this story I think, but ultimately it muddies the waters. Certainly, it's claim that government-funded research played a less than key role in the development of internetworking seems to be just plain false.

First of all, the work Xerox did that most resembles the Internet protocols was not Ethernet, but PARC Universal Packet (PUP), which is indeed quite directly comparable to the IP in TCP/IP. Ethernet, while a terrific piece of work, mostly served to facilitate networking within a single site.

The article also says implies that the Government-funded ARPANET wasn't really the precursor of the Internet. I think that's an over-simplification. Arpanet wasn't the very first packet switching network (see the work of Baran and Davies), and it certainly wasn't an Internet (network of networks), but it really was the direct antecedent of the Internet as we know it. Arpanet connected universities and other research establishments. It proved the viability of a packet-switching network with all the application smarts at the periphery of the network. In almost all cases, what had been Arpanet connections among the early sites evolved (sometimes by way of NSFnet) to TCP/IP Internet connections, running essentially the same applications and services. So, in all those ways, Arpanet was a crucial step on the way to our TCP/IP-based Internet, and of course, ARPANET was government funded.

A much less sensationalist but much more balanced history of all this can be found at: http://www.nethistory.info/History%20of%20the%20Internet/origins.html . The record there strongly suggests that Bob Kahn and Vint Cerf were discussing approaches to internetworking (connecting networks) in spring of 1973. Interestingly, the official PARC Research Report on PUP actually cites the Internet work of Cerf and Kahn, specifically their 1974 A Protocol for Packet Network Intercommunication.

So, the government-funded work on internetworking seems to have started before the Xerox work, and the Xerox research time explicitly cited Cerf and Kahn as sources of inspiration for the Xerox work on internetworking. Wouldn't it be nice of the WSJ article made all that clear before everyone started using these over simplifications to prove the futility of government-funded research?

Comment: Re:Photographic prints! (Score 1) 350

by TwobyTwo (#39933015) Attached to: Ask Slashdot: Best Option For Printing Digital Photos?
Another reason...though somewhat unusual. 40 years ago, I printed on photosensitive cloth a family picture, and it was sewn with backing to make a cover for a throw pillow. The family still has it (and yes, you could get "photo linen" and similar alternatives to printing paper back then). Seriously, for some pictures, people like the look when canvas is mounted. It gives just a bit more of a reminder of a traditional painting I think.

1 Mole = 25 Cagey Bees

Working...