computer science

Sistema 700

Sistema 700 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 Sistema 700 rather than just read about it. In short: Sistema 700 was a personal professional microcomputer, introduced by the Brazilian computer company Prológica in 1981. General information The machine was based on the Intertec Superbrain and had similar characteristics: based on the Zilog Z80A 8-bit, 4MHz microprocessor, it had 64 KiB RAM configuration and two 51⁄4-inch floppy disk drives with capacity for up to 320 KiB of storage.

Key takeaways

Sistema 700 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 Sistema 700 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sistema 700 from memory before moving on to harder problems.

Reference excerpt

Sistema 700 was a personal professional microcomputer, introduced by the Brazilian computer company Prológica in 1981.

General information The machine was based on the Intertec Superbrain and had similar characteristics: based on the Zilog Z80A 8-bit, 4MHz microprocessor, it had 64 KiB RAM configuration and two 51⁄4-inch floppy disk drives with capacity for up to 320 KiB of storage. Its operating system was DOS-700, a version adapted by Prologica's software engineering department from the CP/M-80. It achieved relative commercial success in financial, database and engineering applications. Due to the compatibility with the popular CP/M system, various applications like Fortran ANS, BASIC compiler, COBOL ANSI 74 compiler, Algol, Pascal, PL/I, MUMPS/M, RPG, Faturol C could be used. Other applications like word processors (WordStar), spreadsheets (CalcStar) and databases (DataStar and dBase II) were also compatible. Your applications could be programmed in BASIC, Cobol-80 and Fortran.

Models

Sistema 700 (1981) Initial model announced in 1981, but never went into production (vaporware).

Super Sistema 700 (1981) Final version with graphite-colored cabinet and rounded contours.

Sistema 700 Modular (1985) In August 1985, Prológica released the third generation of the Sistema 700, named the Sistema 700 Modular. It had a larger and more durable keyboard, a built-in magnetic disk, and 10 function keys . It had 64 kilobytes of RAM and 4 kilobytes of EPROM storage. It was equipped with three microprocessors, one of which, an Intel 8035, was dedicated to controlling the keyboard. It was 10% cheaper than the previous model.

Data Storage Data storage was done in audio cassette. Audio cables were supplied with the computer for connection with a regular tape recorder.

Accessories P-720 Printer.

Bibliography Micro Computador – Curso Básico. Rio de Janeiro: Rio Gráfica, 1984, vol. 1, pp. 49–50.

References

Illustrations

Worked examples

Example 1 — a first encounter with Sistema 700

Start with the simplest possible case. Write down what Sistema 700 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 Sistema 700 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 Sistema 700 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 Sistema 700

In research: Sistema 700 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 Sistema 700 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: Sistema 700 is common in secondary-school and first-year university syllabi. It links to neighbouring topics All-in-one computers, Computer-related introductions in 1981, Computer hardware stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Sistema 700 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 Sistema 700 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sistema 700 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 Sistema 700 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sistema 700 in simple terms?

Sistema 700 was a personal professional microcomputer, introduced by the Brazilian computer company Prológica in 1981. General information The machine was based on the Intertec Superbrain and had similar characteristics: based on the Zilog Z80A 8-bit, 4MHz microprocessor, it had 64 KiB RAM configur…

Why does Sistema 700 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 Sistema 700?

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 Sistema 700.