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computer science

Teramac

Teramac is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Teramac rather than just read about it. In short: The Teramac was an experimental massively parallel computer designed by HP in the 1990s. The name reflected the project's vision to provide a field programmable gate array (FPGA) system with capacity for a million gates running at a megahertz.

Key takeaways

  • Teramac belongs to computer science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Teramac to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Teramac from memory before moving on to harder problems.

Reference excerpt

The Teramac was an experimental massively parallel computer designed by HP in the 1990s. The name reflected the project's vision to provide a field programmable gate array (FPGA) system with capacity for a million gates running at a megahertz. Contrary to traditional systems, which are useless if there is one defect, Teramac used defective processors intentionally, to demonstrate its defect-tolerant architecture. Even though the computer had 220,000 hardware defects, it was able to perform some tasks 100 times faster than a single-processor high-end workstation. Teramac was originally developed by scientists in HP's central research lab, HP Labs, in the mid 1990s. Although it contained conventional silicon integrated circuit technology, it paved the way for some of HP's work in nanoelectronics because it provided an architecture on which a chemically assembled computer could operate. The machine used 864 FPGA chips, some for computing, others for routing signals. The experience from this program was used to design the Field Programmable Nanowire Interconnect circuit.

Further reading "A Defect-Tolerant Computer Architecture: Opportunities for Nanotechnology (abstract)" (PDF). Science. 280 (5370): 1716–1721. 12 June 1998. doi:10.1126/science.280.5370.1716. Bruce Culbertson (1998). "Teramac: the million-gate defect-tolerant Custom Computer". HP Laboratories. Archived from the original on 2011-06-07.

Worked examples

Example 1 — a first encounter with Teramac

Start with the simplest possible case. Write down what Teramac claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Teramac before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Teramac ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Teramac

In research
Teramac appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Teramac in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Teramac is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computational science, Hewlett-Packard supercomputers, Massively parallel computers, so understanding it makes those chapters shorter.
In everyday life
Look for Teramac outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Teramac in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Teramac means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Teramac out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Teramac in simple terms?

The Teramac was an experimental massively parallel computer designed by HP in the 1990s. The name reflected the project's vision to provide a field programmable gate array (FPGA) system with capacity for a million gates running at a megahertz.

Why does Teramac matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Teramac?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Teramac.

Tags

  • Computational science
  • Hewlett-Packard supercomputers
  • Massively parallel computers

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