computer science

PMI-80

PMI-80 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 PMI-80 rather than just read about it. In short: The PMI-80 was a single-board microcomputer produced by Tesla Piešťany, Czechoslovakia, since 1982. It was based on the MHB 8080A CPU (a Tesla clone of the Intel 8080), clocked at 1.111 MHz.

Key takeaways

PMI-80 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 PMI-80 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PMI-80 from memory before moving on to harder problems.

Reference excerpt

The PMI-80 was a single-board microcomputer produced by Tesla Piešťany, Czechoslovakia, since 1982. It was based on the MHB 8080A CPU (a Tesla clone of the Intel 8080), clocked at 1.111 MHz. Instead of a raster graphic display output and classical keyboard, it had a calculator-style nine-digit seven-segment red LED display and a 25-key calculator-type keypad with hexadecimal and function keys (including hardware REset and Interrupt). The PMI-80 had 1 KiB of ROM (expandable to 2 KiB) and fixed 1 KiB of RWM. Eight (expandable to 32) I/O lines were provided for user along with complete system bus. Connected could be e.g., a card with a DAC of 0–12 V range.

References

External links PMI-80 information – At the OLD-COMPUTERS.COM website

Illustrations

Worked examples

Example 1 — a first encounter with PMI-80

Start with the simplest possible case. Write down what PMI-80 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 PMI-80 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 PMI-80 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 PMI-80

In research: PMI-80 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 PMI-80 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: PMI-80 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-related introductions in 1982, Microcomputer stubs, Science and technology in Czechoslovakia, so understanding it makes those chapters shorter.
In everyday life: Look for PMI-80 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 PMI-80 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PMI-80 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 PMI-80 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PMI-80 in simple terms?

The PMI-80 was a single-board microcomputer produced by Tesla Piešťany, Czechoslovakia, since 1982. It was based on the MHB 8080A CPU (a Tesla clone of the Intel 8080), clocked at 1.111 MHz.

Why does PMI-80 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 PMI-80?

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 PMI-80.