computer science

Ringo R470

Ringo R470 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 Ringo R470 rather than just read about it. In short: Ringo R-470 was a Brazilian clone of the Sinclair ZX81 by Ritas do Brasil Ltda. introduced in 1983. It featured a Z80A processor at 3.25 MHz, 8K ROM and 16 KB RAM.

Key takeaways

Ringo R470 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 Ringo R470 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ringo R470 from memory before moving on to harder problems.

Reference excerpt

Ringo R-470 was a Brazilian clone of the Sinclair ZX81 by Ritas do Brasil Ltda. introduced in 1983. It featured a Z80A processor at 3.25 MHz, 8K ROM and 16 KB RAM. It wasn't 100% compatible with the ZX81, and some BASIC tokens have alternate codings. It had a connector port for a 1200 bit/s modem and a joystick, and supported data storage using an external cassette recorder at 300 and 2400 bit/s. There was an option to display "inverted video" (white background with black characters) by pressing INVERSE VIDEO. The computer also featured separate arrow keys. The machine had a price of Cr$449,950, higher than competitor computers like the TK85 costing Cr$369,850, and it was not successful. This computer can be emulated on modern systems under EightyOne Sinclair Emulator or MAME.

Keywords and symbols BASIC keywords and character mapping are slightly altered on Ringo R-470 compared to the ZX81. Entry is still accomplished per keyword token, obtained using different cursor modes and key combinations, but these are different from the ZX81. The following table shows the supported BASIC keyword tokens and symbols, and the key combinations needed to enter them.

References

Illustrations

Worked examples

Example 1 — a first encounter with Ringo R470

Start with the simplest possible case. Write down what Ringo R470 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 Ringo R470 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 Ringo R470 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 Ringo R470

In research: Ringo R470 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 Ringo R470 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: Ringo R470 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-related introductions in 1983, Computer hardware stubs, Computers designed in Brazil, so understanding it makes those chapters shorter.
In everyday life: Look for Ringo R470 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 Ringo R470 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ringo R470 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Ringo R470 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ringo R470 in simple terms?

Ringo R-470 was a Brazilian clone of the Sinclair ZX81 by Ritas do Brasil Ltda. introduced in 1983. It featured a Z80A processor at 3.25 MHz, 8K ROM and 16 KB RAM.

Why does Ringo R470 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 Ringo R470?

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 Ringo R470.