Grid Definition and 222 Threads

GRiD Systems Corporation was founded in late 1979 by John Ellenby, who left his job at Xerox Parc and joined Glenn Edens, Dave Paulsen and Bill Moggridge to form one of Silicon Valley's first stealth companies. The company went public in March 1981. It was located at 47211 Lakeview Boulevard, Fremont, California, 94537.
The "GRiD" name with the unusual lowercase "i" in the middle was the result of discussion between John Ellenby, Glenn Edens and John Ellenby's wife, Gillian Ellenby, who pushed for the final choice. The lowercase "i" was a note of thanks to Intel for helping in the early daysGRiD developed and released several pioneering ideas:
First portable computer. Marketed almost exclusively to CEOs
The GRiD Compass 1100, the first clamshell laptop computer
Patented the "clamshell" laptop design
First portable to use non-volatile bubble-memory
GRiD-OS was a multi-tasking Text-based user interface or TUI and operating system
First use of electro-luminescent displays in a portable
First use of magnesium for the case
First use of the Intel 8086 and 8087 floating-point co-processor in a commercial product.
Pioneered the concept of a "bus" for connecting peripherals (using GPIB)
First computer that included a fully functional telephone and telephone handset
The first commercially available tablet-type portable computer was the GRiDPad, released in September 1989. Its operating system was based on MS-DOS.
A GRiD Compass 1101 was the first laptop in space. Required special modification to add a fan to pull air through the case. Subsequently a GRiD 1530 flew on STS-29 in March 1989.
OldComputers.net called the 1982 GRiD Compass 1101 the "grand-daddy of all present-day laptop computers". It had 256k RAM, an 8086, 320x240 screen, and 384k of internal 'bubble memory' that held data with power off.In 1988, Tandy Corporation purchased GRiD. AST Computer acquired the company, and was itself later acquired by Samsung.Edens co-founded Waveform Corp and in 2003 joined the board of F5 Networks Inc.John Ellenby went on to co-found the companies Agilis and Augmented Reality pioneer GeoVector.

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  1. S

    Equivalent resistance for an infinite grid

    There is an infinite square grid with each side of every cell making up the grid of resistance r. What is the equivalent resistance between two adjacent points on the grid?
  2. T

    Parametric Surface Grid Curves: Solving for Tangent Vectors and Angle

    Homework Statement Consider the parametric surface r(u, v) = <vsin(u), vcos(u), v^2> The point (1, 1, 2) is on this surface. Find the grid curve with v constant that contains this point. And the grid curve with u constant that contains the point. Then find tangent vector to both...
  3. N

    Is the MATLAB Emulation of Grid-Connected Photovoltaic Accurate?

    I'm working on this subject. I'm trying to make a MATLAB emulation on this subject. In tha attached pdf I have the equations and the MATLAB code. You think that the graphs below are correct. You think that the current graph shouldn't be "negative". I will be glad to see your comments.
  4. 3

    An infinite grid of 1ohm resistor

    http://xkcd.com/356/ "I first saw this problem on the Google Labs Aptitude Test. A professor and I filled a blackboard without getting anywhere. Have fun." Discuss.
  5. A

    Probability of Forming a Line on a 3x3 Grid with Random Selections

    Consider a 3-by-3 square grid. Suppose you pick 5 of the squares at random. What is the probability that at least 1 line of 3 squares is formed? (3 diagonal squares is NOT a line). I do know that there are 6 combinations of lines that are possible. After that, I'm not sure how to follow along...
  6. M

    Maximizing Points on a Grid: Strategies and Logic

    Ok, I have a teaser and I want to check with all of you on what's the most points. We have a 5x5 grid. That grid can be filled with numbers 1 thru 4. There are rules to placing these. Diagonal directions do not count as neighbours. 1 can be placed anywhere; 2 needs to have 1 as a neighbour; 3...
  7. J

    Exploring Grid Theory: The Possibility of Smallest Movements in a 'Grid' System

    I was just curious, has there been any theories on how small of a movement is possible? For example, moving an atom a certain length, then moving it half that length, then again half, is there a point when you would get to the smallest movement possible (looking at it as the smallest unit of a...
  8. EnumaElish

    Why are sports clubs (gyms) are load, not generator, on the grid?

    Wouldn't an extraterrestrial looking at the sports clubs think that people must be working hard to supply electricity? That they are running on giant dynamos? But isn't the reverse true, that sports machines consume, not generate, electricity? Is it merely a symbol of affluence (that is...
  9. M

    Sheared Parabolic Grid Generator

    Hi, I have created a program to generate grid points for a Joukowski airfoil. I was wondering if anyone knew of a 2D Sheared Parabolic Grid Generator that I could use to get a grid. If you are unfamiliar with this grid, it's basically a long rectangle that is "wrapped" around the airfoil so...
  10. D

    Earth's Magnetic Field Reversal: Impacts on Power Grid

    If you move a magnet towards a loop of wire it will generate a current in that wire. Could a reversal of the Earth's magnetic field be sudden enough to cause significant damage to the Earth's power grid?
  11. S

    How Can I Use a Binary Spatial Data Grid for Vegetation Mapping?

    Hi, Just working on an environmental project about vegetation mapping. I've got a regular grid of points with percentage of plants for each points. I've intepolated the different percentage values to produce distribution maps for each plant. Anyway, now i wonder what i can do if instead of...
  12. Z

    Equation for number placement in Sudoku-like grid

    Here's a problem that I need help figuring out... imagine a 9x9 grid filled with the numbers 1-81 starting in the upper left corner and progressing left to right, top to bottom; like so: /--------------------------------------------\ | 1, 2, 3 | 4, 5, 6 | 7, 8, 9 | |...
  13. N

    Can You Send Electricity Back to UK Grid?

    Can electricity be sent back into the UK national grid via a normal household plug socket?
  14. C

    Can You Help Me Find an Algorithm to Fill a Grid Without Repeating Places?

    Hi: I'm looking for an algorithm to fill a grid without repeating places. I have looking for Pseudorandom number lists (http://en.wikipedia.org/wiki/List_of_pseudorandom_number_generators#gsl_rng_minstd) but i do not get it clearly... Any help ? :)
  15. H

    Wind Power - Reliable? vs Nuclear? Effect on Grid.

    Could not find a thread on this particular topic, but I want to verify my thoughts. I emailed my local Green Party rep in Canada here regarding his partys take on Nuclear Power. Our particular area of Canada is facing a bit of a situation where more megawatts NEEDS to be available in the...
  16. A

    MATLAB MATLAB Spirograph Animations with Grid Lines

    I have a small technical problem in MATLAB. I am trying to use comet to make an animated path of this spirograph program I've made. I'd also like to add some grid lines however my problem is the following. If i run the comet command everything looks great and works fine, but if I then use a...
  17. L

    Fortran code for projecting a grid on to a surface

    Does anyone know the fortran code for projecting a grid (cartesian or not) onto a surface? Thnx
  18. L

    Project a 3-D traingle at a square grid onto a scrunched-up paper

    How do I project a 3-D traingle at a square grid onto a scrunched-up paper like surface?
  19. B

    Counting Shortest Paths in a Square Grid

    Is there a concise, easily calculable way to count the sum of all the paths from the lower left corner of a square of integer size to the upper right corner where you only move up or right in steps of 1 unit, PLUS all the partial paths? i.e. if you have a city with roads in a 10x10 grid (100...
  20. B

    Number of Paths from (1,1) to (10,10) in 10x10 Grid

    How many paths of up, down, left, or right moves are there from point (1,1) to point (10,10) in a 10x10 grid of points? No path may use any square more than once. Paths may be of any length. If it's easier, say that the bottom row of pixels is connected to the top row of pixels and the left...
  21. G

    How Many Ways to Arrange Marbles in a 6x6 Grid Without Color Repetition?

    Okay, say you have a 6x6 grid. You have 36 marbles, in 6 colors, with 6 of each color. You want to arrange the marbles on the grid so that no row or column contains two marbles of the same color. How many ways are there to do this?
  22. K

    Exploring Grid Networking: Find Resources and Learn the Basics

    Iam new to the concept of Grid Networking. Can anybody explain it ? Is there any forum/ site to know more on tht subject ? What kind of softwares should i use ? PLz Help !
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