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GMC-4

GMC-4 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 GMC-4 rather than just read about it. In short: The GMC-4 is the only 4-bit microcomputer to be mass-produced in the last 30 years (as of 2009). It was produced by Gakken, a Japanese publisher who distributed it with a magazine attached to a box containing the components required to assemble the computer.

GMC-4 — main illustration
GMC-4 — illustration

Key takeaways

  • GMC-4 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 GMC-4 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of GMC-4 from memory before moving on to harder problems.

Reference excerpt

The GMC-4 is the only 4-bit microcomputer to be mass-produced in the last 30 years (as of 2009). It was produced by Gakken, a Japanese publisher who distributed it with a magazine attached to a box containing the components required to assemble the computer. It is based on the Texas Instruments TMS1100 microcontroller. The GMC-4 is a modernized version of Gakken's 1983 Gakken FX-System, also known as the R-165. This system was also sold by Radio Shack as the Science Fair Microcomputer Trainer, but replaced the FX's circuit board with hand-wired circuity assembled by the user using springs to hold short bits of wire. The purpose of the GMC-4 is education. It provides an accessible way to learn about assembly language and the principles of computing.

References

External links

Description of the kit, assembly language and example programs Programming the Gakken GMC-4 Microcomputer, archived from the original on 2011-11-20 Example programs gmc4cc (C Compiler for GMC-4) G4CBASIC

Illustrations

GMC-4: GMC-4
GMC-4

Worked examples

Example 1 — a first encounter with GMC-4

Start with the simplest possible case. Write down what GMC-4 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 GMC-4 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 GMC-4 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 GMC-4

In research
GMC-4 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 GMC-4 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
GMC-4 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Microcomputers, Single-board computers, so understanding it makes those chapters shorter.
In everyday life
Look for GMC-4 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 GMC-4 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what GMC-4 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 GMC-4 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GMC-4 in simple terms?

The GMC-4 is the only 4-bit microcomputer to be mass-produced in the last 30 years (as of 2009). It was produced by Gakken, a Japanese publisher who distributed it with a magazine attached to a box containing the components required to assemble the computer.

Why does GMC-4 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 GMC-4?

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 GMC-4.

Tags

  • Microcomputers
  • Single-board computers

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