computer science

Lira 512

Lira 512 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 Lira 512 rather than just read about it. In short: Lira 512 (also known as Lira XT) was an IBM PC XT compatible computer made by the Yugoslav (now Serbian) company EI Niš in the late 1980s. It was first presented to the public in April 1988 at the “Kompjuter ‘88” computer show in Belgrade.

Key takeaways

Lira 512 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 Lira 512 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lira 512 from memory before moving on to harder problems.

Reference excerpt

Lira 512 (also known as Lira XT) was an IBM PC XT compatible computer made by the Yugoslav (now Serbian) company EI Niš in the late 1980s. It was first presented to the public in April 1988 at the “Kompjuter ‘88” computer show in Belgrade. Soon after that, Lira 512 was also presented in Yugoslav computer press. The main purpose of Lira 512 was to be used in computer classrooms. What separates Lira 512 from most of the other XT compatibles is that keyboard is included just above in the same case (together with the 3.5’’ floppy drive), which made it similar in appearance to the original Atari ST or the Amiga 500.

Specifications Lira 512 has the following technical specifications:

CPU: Intel 8088 running at 4.77 MHz or 10 MHz (turbo) ROM: 8 KB Award BIOS, expandable to 32KB RAM: 512 KB (expandable up to 640 KB) Operating system: MS DOS 3.21 Secondary storage: 3.5’’ Panasonic 720KB floppy drive Display: two display adapters (only one can be used at a time) Hercules compatible adapter (monochrome 80 × 25 text or graphic 720 × 348) CGA compatible adapter (color text 40 × 25, 80 × 25 or graphic 320 × 200, 640 × 200) Sound: beeper I/O ports: composite, RF and DE9 RGB video output, RS-232 (DB25 male + DE9 male connector reserved for the mouse), parallel port (DB25 female connector), external floppy connector, DA15 PC joystick female connector, light pen and expansion connector Power supply 40W Lira has two display adapters (monochrome Hercules compatible and color CGA compatible), where the active video adapter is chosen by the back-panel switch. A 40W power adapter is also installed in the same case.

Image gallery

Other Lira models

Lira XT Tower Lira XT Tower was released about a year after the original Lira 512, because it was realized that the compact case limited hardware expansion. To address this issue, especially to allow for the installation of a hard disk, the case was changed to a slimline tower.

Lira AT The new Lira AT was released at about the same time as the Lira XT Tower, with a similar looking slimline tower case. Lira AT was a IBM PC AT compatible, equipped with a 80286 CPU, 1MB of RAM, a EGA compatible video adapter, two 3.5" floppy drives and a 40MB hard disk. Serial production of this model started in December 1989.

Lira 386 The Lira 386, based on a 80386 CPU, was ready for production by 1990.

References

Illustrations

Worked examples

Example 1 — a first encounter with Lira 512

Start with the simplest possible case. Write down what Lira 512 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 Lira 512 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 Lira 512 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 Lira 512

In research: Lira 512 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 Lira 512 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: Lira 512 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-related introductions in 1988, Computer hardware stubs, IBM PC compatibles, so understanding it makes those chapters shorter.
In everyday life: Look for Lira 512 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.

Affiliate

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

How to study Lira 512 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lira 512 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 Lira 512 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lira 512 in simple terms?

Why does Lira 512 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 Lira 512?

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 Lira 512.