computer science

Pentagon (computer)

Pentagon (computer) 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 Pentagon (computer) rather than just read about it. In short: The Pentagon (Russian: Пентагон) home computer is an enhanced clone of the British-made Sinclair ZX Spectrum 128. It was manufactured by amateurs in the former Soviet Union, following freely distributable documentation.

Key takeaways

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

Reference excerpt

The Pentagon (Russian: Пентагон) home computer is an enhanced clone of the British-made Sinclair ZX Spectrum 128. It was manufactured by amateurs in the former Soviet Union, following freely distributable documentation. Its PCB was copied all over the ex-USSR between 1991-1996, making it a widespread ZX Spectrum clone. The name "Pentagon" derives from the shape of the original Pentagon 48 PCB which has a diagonal cut in one of the corners, giving it five sides.

Versions Pentagon 48K (1989 by Vladimir Drozdov) Pentagon 128K (1991) Pentagon 128K 2+ (1991 by ATM) Pentagon 128K 3+ (1993 by Solon) Pentagon 1024SL v1.x (2005 by Alex Zhabin) Pentagon-1024SL v2.x (2006 by Alex Zhabin) Pentagon ver.2.666 (2009 by Alex Zhabin) The Pentagon 1024SL v2.3 included most of the upgrades of the standard Spectrum architecture, including 1024 KB RAM, Beta 128 Disk Interface and ZX-BUS slots (especially for IDE and General Sound cards). This model also featured a "turbo" mode (7 MHz instead of the original's 3.50 MHz).

Upgrades from the original ZX Spectrum Extra RAM ranging from 256 KB to 4 MB Several sound card possibilities such as Covox (usually named as SounDrive) or DMA UltraSound Additional video modes: 512x192 monochrome, 384x304, 256x192x15 (with no Attribute clash) CMOS with persistent real-time clock IDE Controller for hard drives "Turbo Mode" that clocks the CPU up to 7 MHz

References

External links

Russian most popular Spectrum models Archived 2012-07-16 at the Wayback Machine Pentagon 1024 official site (in Russian) Schematic diagram of the Pentagon 48K and drive controller (DjVu) 128K Schematic diagram of the Pentagon (the DjVu) Schematic and wiring diagrams Pentagon 128K 1991, revised and enlarged version (PNG) Wiring diagram 128K the Pentagon (the PNG) NEW English FaceBook Group

Illustrations

Worked examples

Example 1 — a first encounter with Pentagon (computer)

Start with the simplest possible case. Write down what Pentagon (computer) 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 Pentagon (computer) 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 Pentagon (computer) 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 Pentagon (computer)

In research: Pentagon (computer) 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 Pentagon (computer) 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: Pentagon (computer) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1989 establishments in the Soviet Union, Computer-related introductions in 1989, Soviet computer systems, so understanding it makes those chapters shorter.
In everyday life: Look for Pentagon (computer) 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Pentagon (computer)” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Pentagon (computer) in 20 minutes

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

Frequently asked questions

What is Pentagon (computer) in simple terms?

Why does Pentagon (computer) 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 Pentagon (computer)?

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 Pentagon (computer).