computer science

Varix VC 50

Varix VC 50 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 Varix VC 50 rather than just read about it. In short: The VC 50 was an 8-bit home computer produced in Brazil by the company Engetécnica (later called Varix) between 1983 and 1985. It was one of the many clone machines based on the TRS-80 Color Computer introduced during the Brazilian "Market Reserve", like the Codimex CD-6809 or Prológica CP 400 COLOR.

Key takeaways

Varix VC 50 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 Varix VC 50 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Varix VC 50 from memory before moving on to harder problems.

Reference excerpt

The VC 50 was an 8-bit home computer produced in Brazil by the company Engetécnica (later called Varix) between 1983 and 1985. It was one of the many clone machines based on the TRS-80 Color Computer introduced during the Brazilian "Market Reserve", like the Codimex CD-6809 or Prológica CP 400 COLOR.

History

Launched in 1983, the initial target audience for the VC50 was mainly agricultural companies, sugar mills and distilleries. The machine, originally equipped with an integrated floppy disk drive and numeric keypad, came to be used as a controller for industrial manufacturing processes and for financial and production calculations related to agriculture. Varixx, formerly Engetécnica/Varix, developed specific software packages for these usages (including for example of sucrose content control or freight price list generation). The machine faced competition from established business machines like the CP 500 and the Sistema 700, both from Prológica, as well as Apple II compatibles, having a limited success, with 500 to 1000 units sold. Despite intending to establish itself as a professional computer, the VC 50 also tried to compete with other Brazilian TRS-80 Color Computer clones, like the CP 400. It was not successful due to the extra cost of the integrated floppy disk drive.

Technical features The basic features of the VC 50 are similar to the TRS-80 Color Computer.

CPU: Motorola 6809E, 890 kHz to 1.8 MHz Memory: ROM: 16 KB (containing Varix BASIC) RAM: 64 KB Keyboard: Built-in, 52-keys plus 12-keys keypad Display: Motorola 6847, 9 colors Text mode (with 32 × 16 characters) Low resolution graphics (with 64 × 32 pixels) Medium and high resolution graphics (up to 256 × 192 pixels, 2 colors per pixel) Expansion port (cartridges, disk interfaces, etc.) Built in disk drive: 180K, single-sided Other ports: Composite video monitor (PAL-M color TV using an external modulator) RS-232C serial port Analogue or digital joysticks Cassette recorder (1500 baud, with remote engine control)

See also Motorola 6809 CP 400 COLOR Codimex CD-6809 LZ Color 64 TRS-80 Color Computer

References

Illustrations

Worked examples

Example 1 — a first encounter with Varix VC 50

Start with the simplest possible case. Write down what Varix VC 50 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 Varix VC 50 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 Varix VC 50 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 Varix VC 50

In research: Varix VC 50 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 Varix VC 50 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: Varix VC 50 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 Varix VC 50 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 Varix VC 50 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Varix VC 50 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 Varix VC 50 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Varix VC 50 in simple terms?

Why does Varix VC 50 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 Varix VC 50?

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 Varix VC 50.