What is Grid: Definition and 222 Discussions

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. anorlunda

    Is increasing diversity and decentralization the key to grid cybersecurity?

    Whenever the subject of cyber security is raised, attacks on the power grid are the first example offered almost all the time. Nobody should be surprised then that there is a tremendous amount of activity and huge amounts of money being spent on grid cyber security. Much of that is being...
  2. S

    Equal flow distribution to 3x3 grid

    This may be more of a math problem; it arose out of my curiosity of manipulating LED matrices and reminds me of a traffic flow problem, but I am sure it can model a variety of applications. Its not a homework problem but would probably make a good one! You have a 3x3 grid of points, each...
  3. M

    Average size of connected components in grid

    Start with an infinite 2d grid of cells, with each cell randomly colored black or white (50% chance). Now take the graph G whose nodes are the cells, and with an edge (A, B) if A and B are adjacent in the grid, and the same color. What is the average size of a connected component of G? Is it...
  4. M

    Number of triangles in a square grid of unknown size

    Hello. I came up with this problem while I was waking up this morning, and some of the finer aspects have me pretty confused. First off, I made the simplification of a square grid because I'm not yet ready to deal with non-square grids, but maybe we can get to that later. Here's where I got...
  5. D

    Help brainstorming a Smart Grid Project

    Any ideas on how I could put together a smaller prototype of a smart grid system? Just brainstorming here but here are a few things I was thinking Grid in a BOX Marketability is key right? So why not design some kind of "smart box" system that residential home owners can use in their homes...
  6. C

    Worldwide Solar Grid Hypothetical

    Hi everyone, I am humbly here to ask a question. I have no EE training or education (as will become apparent) but I couldn't sleep and my head was churning and now I need to know: Can you operate a city or country on solar power generated on the other side of the globe? i.e. Could solar...
  7. dlgoff

    What is The Grid - Visualization Maps

    What is "The Grid" -- Visualization Maps As PF grows, so does the number of questions about the "grid". While I was searching the internet for an image of a sagging transmission line to use in another thread, I found this cool interactive map by NPR. I thought I'd post it for those curious...
  8. P

    How can we get people off the grid for less than a thousand dollars?

    This is a small experiment I would like to conduct. I was told if you can give a scientist a problem, they will always have an answer. No matter how unrealistic. I am here to ask all of you to ponder a practical and realistic way to get people off of the power grid. The ideas expressed should...
  9. U

    Electric Grid Question - Elevated Transmission Lines

    Electric Grid Question -- Elevated Transmission Lines Hi, Our teacher gave to us an homework which is if we carry transmission lines at 20000 m (20km) high from Earth face, what is this application's benefits and harms? Can anyone help me? Already thanks for your replies...
  10. M

    Can 225vac from Solar flow back to grid?

    Note, this is in the USA, where the street lines are 4,800vac (I think?)...and the lines from the pole are 220VAC to the panel. For example, let's say I'm making 225vac from a DIY solar array (connected to my main panel), and the amount of energy I'm currently producing is more than what...
  11. V

    Pelton turbine model when hydroelectric station works on grid

    Hi! When my Hydroelectric station is not connected to a GRID (islanded mode) I control the frequency or the speed, and here are the equations for my turbine: http://oi46.tinypic.com/3127ixe.jpg Look the third equation. I built that in Matlab Simulink, and my out put is turbine speed...
  12. S

    Determining whether grid coordinates lie within a circle

    I have a grid and want to determine whether a point lies within (our outside of) a circle. The grid cells simply have integer coordinates, e.g. x = 5, y = 7. The circle's radius is known, and also an integer value. I wrote a program that can place points in a (quantized) circle using...
  13. A

    Proving the Existence/Non-Existence of a Grid Tour

    Homework Statement Consider a grid with height p >= 2 and width q >= 2, so there are pq squares in the grid. A valid walk on the grid is a walk that starts on one square and subsequently moves to adjacent squares (you cannot move diagonally). Define a tour to be a valid walk on the grid that...
  14. beyondlight

    MATLAB Make a grid on a map in matlab

    I am working on a Bachelors thesis and need to make a grid on a map over a entire floor. Can someone show me how to do this in matlab?
  15. S

    Grid connected transistor bridge inverter

    Homework Statement Hi there. I was just wondering if anyone can conform that my method for this problem is correct so far? The transistor-bridge converter shown below is being used to connect a PV array to the grid. For the purpose of this coursework, you may assume that: • The PV array...
  16. Q

    [Matlab] Grid renumbering for Matrix

    Homework Statement I have a matrix A \in R^{m x m} where m = n^{2} and n = 2^{k} +1, k= 0,...,L. As in the image attached,the original numbering in the case k=1 is [ 1 2 3 4 5 6 7 8 9], i want the nodes to be renumbered to a new numbering T=[2 4 5 6 8 1 3 7 9] (meaning position 2 in...
  17. A

    Rotation of Gridded Spherical Coordinates to the Same Grid

    I have a uniform grid of data in spherical coordinates. e.g. theta = 0, 1, 2, ... 180 and phi = 0, 1, 2, ... 359 which forms a 2D matrix. I wish to rotate these points around a cartesian axis (x, y, z-axis) by some angle alpha. To accomplish this I currently do the following: 1. Convert to...
  18. krash661

    Hangout With Cern: Lhc And The Grid

    Hangout With CERN: LHC and the Grid - Big data, big questions Public · By CERN usually every thursday 5:00pm in UTC+01 http://hangouts.web.cern.ch/ http://youtube.com/CERNTV Last week we showed you how global computing helps CERN store, distribute and analysis around 25 Petabytes...
  19. P

    Proof regarding distances from a point in a grid

    Homework Statement Given a grid, x by y, where x and y are integers both greater than or equal to one, prove that it is impossible for there to be a point (a,b) where the distance d from (a,b) to three distinct corners of the grid are equal only for these three corners (i.e. the point has to...
  20. P

    Solar grid tie inverter night time loss

    I have three grid tie inverters connected to my grid thru standard AC plugs. The system pushes about 1kw to the grid during the day but during the night they draw a total of 45 watts from the grid. This has been confirmed by measuring the ac current in the ac cord with a multimeter and with a...
  21. M

    Electrical Question - Grid Tie Power Inverters for Home Use

    Electrical Question -- Grid Tie Power Inverters for Home Use Since we are being careful let us assume we have a doll house that is powered by only a 12v source. Inside the doll house, Julie, the doll living there, gets it in her head to construct a 1.2v solar system on the roof of her doll...
  22. H

    Shortest path problem with multiple goals on a grid

    Hi, I've been reading up a bit on the shortest path problem in graph theory and was wondering if the problem I'm trying to solve is a variation of the same graph theory problem. Say you have a grid of vertices and edges representing aisles and cross-aisles in a warehouse. In a standard...
  23. C

    Pascals Triangle - Number of Routes on a Grid

    Homework Statement Deepa’s house is five blocks west and four blocks south of a bus stop. A store is three blocks west and one block south of the bus stop. How many ways can Deepa walk home if she wishes to stop on her way home by walking only west and south? Homework Equations...
  24. J

    Finding the index number on a stretched cartesian grid

    Imagine I have a set of discrete points equally spaced out and indexed from 1 to n (a 1D grid). On a cartesian grid if the spacing, dx, is constant the index can be obtained simply by: i = floor(x/dx) That was pretty simple, now if the cartesian grid is stretched (i.e. dx is not constant)...
  25. U

    Uniform grid of points on a sphere

    How can one create a uniform solid-angular distribution of vectors in 3D space from a common origin, or in other words a grid of points on the surface of a sphere wherein the points are equidistant from each other? Spherical polar coordinates/the latitude-longitude scheme is obviously not the...
  26. F

    What is grid voltage measured with respect to?

    When a vacuum tube data sheet states that it will conduct a given amount of milliamps with a designated grid voltage (the anode and cathode voltages being fixed in this example), is this grid voltage given with respect to the anode plate or cathode? I find it confusing because the grid voltages...
  27. F

    Control of grid connected photovoltaic system

    Hi guys, I am doing a final year project this semester on the above topic. I wanted to know whether to implement hardware or using software like Matlab. Thanks in advance.
  28. G

    Periodic boundary conditions for 2d grid

    Hello , i am trying to implement this algorithm for 2d grid. 1) i am not sure if my calculations are correct. 2 ) i don't understand how to return my final calculation ( how will i insert to the matrix i want (the 's' in this example) the new coordinates (xup,xdow,yup,ydown)). I mean ...
  29. S

    Troubleshooting a problem with a 30-Bus grid with Powerwolrd simulator

    Troubleshooting a problem ...Urgent please ! hello everyone , I'm working on 30-Bus grid with Powerwolrd simulator ( version 15 ) and I'm facing some troubles with the results ...I got some different values from the one I was expecting , such as low voltages on some of the buses , different...
  30. U

    MATLAB Regulate Grid Transparency in Matlab - Uku

    Hello! Is there a way to regulate grid transparency in matlab? Thanks, Uku
  31. M

    Creating a grid in Fourier-space

    Hello, I'm new here and not sure where to put this question, which is more of a mathematical question, but also involves some programming in python (mainly the use of numpy.fft). I have a code which creates a square image with dimensions 4x4 arcsec running from -2 arcsec to +2 arcsec and...
  32. B

    Grid or Generator failure - Why cant you stay online?

    In the case of a power grid or generator failure, the former which chernobyl was testing for and the later which occurred at Fukushima - why can't you stay online, use the electricity your producing to power the pumps and sink the excess electricity into the ground? I have no engineering...
  33. M

    Why do wire-grid polarizers have a separation less than the wavelength?

    I've read about wire-grid polarizers from wikipedia. The article says that waves perpendicular to the wires cannot induce electron movement and hence they pass through with minimal energy loss. On the other hand, waves parallel to the wires are reflected by the wires because electron movement is...
  34. M

    Wire Grid Polarizers: Exploring Electron Movement

    I've read about wire-grid polarizers from wikipedia. The article says that waves perpendicular to the wires cannot induce electron movement and hence they pass through with minimal energy loss. On the other hand, waves parallel to the wires are reflected by the wires because electron movement is...
  35. I

    Why does the frequency on a power grid increase when generation exceeds load?

    I could rephrase the same question, why does the frequency decrease when load exceeds generation? I know these are fundamental operating characteristics of a power system network but I'm not sure I can mathematically prove it. My best guess is that everything dissipates more power when the...
  36. C

    Why is three phase power rare in US homes?

    Utility poles have a grounded wire. Is this just for lightening? Is not connected the neither one of the 3 phase wires, is it? Is the static electricity wire always present, and is it grounded (at every pole, or every x poles)? What does the multi-grounded neutral wire do, and has it always...
  37. S

    What is the difference between Grid and Sub-station?

    what is the difference between Grid and Sub-station?
  38. S

    Difference between Grid and Sub-station

    what is the difference between Grid and Sub-station?
  39. I

    What is the various function block in a grid tie VAWT system?

    Homework Statement Hi, i don't know really am i suppose to ask here but I've still try! I'm actually required to do a report on grid-tie VAWT system which i have taken some pictures (attached file below) on the installation site. But I'm quite puzzled with the picture pertaining the "Router...
  40. B

    Connecting a synchronous generator to the grid

    Hi for a project i need to connect a synchronous generator to the electrical grid, i need to use 2 curcuit breakers and . How to determine the cross section of the cables required and how to connect them to the 2 curcuit breakers.
  41. T

    Numerical solution of continuity equation, implicit scheme, staggered grid

    Hi! I'm trying to implement an implicit scheme for the continuity equation. The scheme is the following: http://img28.imageshack.us/img28/3196/screenshot20111130at003.png With \rho being the density, \alpha is a weighing constant. d is a parameter that relates the grid spacing to the...
  42. T

    Numerical solution to hyperbolic PDE - grid leapfrog - what to do at boundary

    Hi! I'm implementing a scheme to solve the following equation \frac{\partial \psi}{\partial t}=-c_{s} \cdot \frac{\partial \phi}{\partial x} \frac{\partial \phi}{\partial t}=-c_{s} \cdot \frac{\partial \psi}{\partial x} c_{s} is just the isothermal velocity of sound. The equations are for a...
  43. P

    How can I optimize 3000 variables for spline control points in image warping?

    Dear All Firstly thank you for looking at my post. I am trying to nonlinearly warp an image with respect to another using a free form deformation. I am trying to code the following paper in matlab: http://www.cs.jhu.edu/~cis/cista/746/papers/RueckertFreeFormBreastMRI.pdf I understand...
  44. M

    Feeding electricity to the grid and generator loads

    Hi, I am in processing of sizing a generator that biomass as fuel to be fed back to the grid as part of feed in tariff initiatives. However, I would like to know roughly how this feeding mechanism works. For example, in a workshop, a machine motor would initially draw up to 5X the rated motor...
  45. M

    Exploring the National Grid: Advantages, Disadvantages, and How it Works

    What is the national Grid? Where does it run? How does it work? What is a transformer? 3 Advantages of the national grid 3 disadvantages of the national grid Any help would be a great help. :D
  46. N

    Modeling a wire grid polarizer.

    Hello, I keep myself busy by trying to model/predict standing waves in the optical path of a heterodyne spectrometer we built in our lab. We split and combine the local oscillator and the sky (it's for astronomy) with a beam splitter. Our beam splitters are wire grid polarizers. The...
  47. D

    Effect of Solar Storms on the Grid and Nuke Plants?

    I found a recent article suggesting that solar storms predicted in in the next few years pose a serious threat to the electrical grid and thus to nuclear plant cooling systems: "Severe Solar Storms Could Disrupt Earth This Decade: NOAA," International Business Times...
  48. Vorde

    Number of squares in a grid of dots.

    This is a problem that I just thought of the other day and am intrigued by, let me set it up. You have an n x n grid of dots, so that each dot is 1 away from the four dots closest in each direction. My question is; for a grid of n2 dots, what is the total number of possible combinations of...
  49. Z

    What is a lock-in amplifier with a forcing grid ?

    What is a "lock-in amplifier with a forcing grid"? The context of the title is in an undergrad paper, concerning plasma waves in an glow discharge column. The paragraph which mentioned this is in the section of the paper, Suggestions for Further Research: The most important step remaining...
  50. J

    Distorted grid effect in photo of LCD screen

    What causes this effect? What am I seeing?
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