Ptc Computer Logo

[Etta Lesniak]

A general-purpose language, Logo is widely known for its use of turtle graphics, in which commands for movement and drawing produced line or vector graphics, either on screen or with a small robot termed a turtle. The language was conceived to teach concepts of programming related to Lisp and only later to enable what Papert called "body-syntonic reasoning", where students could understand, predict, and reason about the turtle's motion by imagining what they would do if they were the turtle. There are substantial differences among the many dialects of Logo, and the situation is confused by the regular appearance of turtle graphics programs that are named Logo.

Logo is a multi-paradigm adaptation and dialect of Lisp, a functional programming language.[3] There is no standard Logo, but UCBLogo has the best facilities[according to whom?] for handling lists, files, I/O, and recursion in scripts, and can be used to teach all computer science concepts, as UC Berkeley lecturer Brian Harvey did in his Computer Science Logo Style trilogy.[4]

Logo was created in 1967 at Bolt, Beranek and Newman (BBN), a Cambridge, Massachusetts research firm, by Wally Feurzeig, Cynthia Solomon, and Seymour Papert.[5] Its intellectual roots are in artificial intelligence, mathematical logic and developmental psychology. For the first four years of Logo research, development and teaching work was done at BBN. The first implementation of Logo, called Ghost, was written in LISP on a PDP-1. The goal was to create a mathematical land where children could play with words and sentences.[6] Modeled on LISP, the design goals of Logo included accessible power[clarification needed] and informative error messages. The use of virtual Turtles allowed for immediate visual feedback and debugging of graphic programming.

Logo's most-known feature is the turtle (derived originally from a robot of the same name),[5] an on-screen "cursor" that shows output from commands for movement and small retractable pen, together producing line graphics. It has traditionally been displayed either as a triangle or a turtle icon (though it can be represented by any icon). Turtle graphics were added to the Logo language by Seymour Papert in the late 1960s to support Papert's version of the turtle robot, a simple robot controlled from the user's workstation that is designed to carry out the drawing functions assigned to it using a small retractable pen set into or attached to the robot's body.

As a practical matter, the use of turtle geometry instead of a more traditional model mimics the actual movement logic of the turtle robot. The turtle moves with commands that are relative to its own position, LEFT 90 means spin left by 90 degrees. Some Logo implementations, particularly those that allow the use of concurrency and multiple turtles, support collision detection and allow the user to redefine the appearance of the turtle cursor, essentially allowing the Logo turtles to function as sprites.

Turtle geometry is also sometimes used in environments other than Logo as an alternative to a strictly coordinate-addressed graphics system. For instance, the idea of turtle graphics is also useful in Lindenmayer system for generating fractals.

Some modern derivatives of Logo allow thousands of independently moving turtles. There are two popular implementations: Massachusetts Institute of Technology's StarLogo and Northwestern University Center for Connected Learning's (CCL) NetLogo. They allow exploring emergent phenomena and come with many experiments in social studies, biology, physics, and other areas. NetLogo is widely used in agent-based simulation in the biological and social sciences.

Although there is no agreed-upon standard, there is a broad consensus on core aspects of the language. In March 2020, there were counted 308 implementations and dialects of Logo, each with its own strengths.[8] Most of those 308 are no longer in wide use, but many are still under development. Commercial implementations widely used in schools include MicroWorlds Logo and Imagine Logo.

Logo was a primary influence on the Smalltalk programming language. It is also the main influence on the Etoys educational programming environment and language, which is essentially a Logo variant written in Squeak (itself a variant of Smalltalk). Logo influenced the procedure/method model in AgentSheets and AgentCubes to program agents similar to the notion of a turtle in Logo. Logo provided the underlying language for Boxer. Boxer was developed at University of California, Berkeley and MIT and is based on a literacy model, making it easier to use for nontechnical people.[28]

This cool resin decal, exclusively from Gollihur Music, is designed and shaped to go on your MacBook* computer, and overlays the light-up Apple* logo on the cover. It has a simple bass clef design, rendered in clear against a black background - so when the logo lights up, the bass clef glows! Super cool, and original, it will personalize your Mac and let people know that you're a member of the "Nation of Bass." Definitely more subtle than our "BASS" oval (but they're cool, too!)

So, you don't have to put it on your Mac, you can put it most anywhere - though it's designed for indoor use only (so don't put it on your car). Professionally designed and manufactured, you get one domed, adhesive-backed resin logo on a backing paper. Simple peel-and-stick.

* "MacBook" and "Apple," and related names and marks, are trademarks of Apple Inc.

We send occasional correspondence from Gollihur Music. Yes, some of it is promotional, to tell you about new products, special offers, and the like -- but it's also informative, with lesson materials, technical help, tips and tricks, and more.

What happens if you disconnect the hard drive then try to boot it. ( I know it will not boot without a hard drive) Just to see if it does anything different or gives an error. It will help narrow down the issue.

Turn off the computer, and then connect the power cord.
Press and hold the Windows key and the B key at the same time, and then press and hold the power button for 2 to 3 seconds.
Release the Power button but continue pressing the Windows and B keys. You might hear a series of beeps.
The HP BIOS Update screen displays and the recovery begins automatically. Follow any on-screen prompts to continue the startup to complete the recovery.
HP BIOS Update recovery in progress

If the HP BIOS Update screen does not display, repeat the previous steps but press the Windows key and the V key. If the screen still does not display, your computer might not support the feature or there is a hard drive issue. Continue to the next step to install a BIOS recovery file from the HP website.
If the Power light turns off, the Power button was held too long. Repeat the previous steps, making sure to hold the button for only 2 to 3 seconds.

All great recommendations so far. You might also want to remove the battery, as well as the power cord. Once both are removed, drain the flee power by holding the power button for about 10 seconds. Then, place the power cord back in, and try to boot it again.

All good advice above giving you suggestions of what to try. Sometimes a PC will not boot up as is trying to read the storage devices information and maybe waiting for them to respond. The procedure to diagnose is 1. If a laptop try removing power sources, hold down power on button for about 30 seconds and at the same time press all other buttons. 2. Check power supply with DVM or know good swap. 3. Remove all storage devices and try. 4. Reseat RAM. 5 Strip motherboard out and power it up with the minimum needed to get it booting to BIOS (display, keyboard, stick of RAM).

first please tell us more about your problem is it your pc start means have seen any logo display message or have your pc beeps or suddenly your pc cpu fan speed increased and in all dell pc , laptop,etc have error code which they give us in the from of beeps and blinking light in other color.

first open your desktop panel look inside it unplug the hard drive remove cmos battery remove all ram and then start it without RAM now your desktop beeping then press power button then clean your Ram pins with eraser due moisture your system RAM gets some carbon stick with it then put your Ram into system one by one first insert 1 ram then start your desktop if you get display means if your system shows dell logo then power of your system once again and put both ram on it and then check is you get display with those ram then if you get display then goto bios by pressing F2 or delete key if you go successfully in bios then plug your hardrive again then check is it solve your problem this is necessary step which you can do easily.

The problem got figured out. We had to remove the hard-drive to start it up and remove all the things plugged in including our back up storages. The only problem is it still has is that if it gets shut off it does not boot up with one of the specific back up storages plugged in, but the other plug ins are fine. Thank you everyone for answering my question.

Make sure the BIOS is the latest. This can happen on some motherboards if you have a USB stick plugged in because the BIOS is looking at all the attached storage devices trying to evaluate them. Make sure that the bootable BIOS order points to your hard drive first and set the boot flag on it.

I have this issue after I accidentally closed something with task manager, PC turn off and said it was going to try to resolve the issue, it was talking too long so I just power it off and now it wont go pass the hp logo boot screen, I have run a dsp test and everything came fine. I think the issue is with the boot sequence, i think that the issue has something to do with my gaming controller when it boots up. I have tried to disconnect all unnecessary items, I've check hard drive and all related things with f2 and everything is fine but why wont pc get pass hp logo screen? I really dont know what the issue is. I've left the PC yesterday after I did all sorts of test and woke up and it's still on the hp boot screen. How can a little task manger close do such a thing to my PC. Anyway I could reset the usb driver info

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