computer science

XYZ (computer)

XYZ (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 XYZ (computer) rather than just read about it. In short: XYZ was the first Universal Digital Machine from the family of early computers built and launched in Poland in 1958. It was ahead of EMAL2 by a few months, while the earlier EMAL was not fully launched.

Key takeaways

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

Reference excerpt

XYZ was the first Universal Digital Machine from the family of early computers built and launched in Poland in 1958. It was ahead of EMAL2 by a few months, while the earlier EMAL was not fully launched.

Construction XYZ computer was built and launched in Warsaw at ul. Śniadeckich 8, at the premises of the Bureau of Calculations and Programs of the Mathematical Apparatus Department of the Polish Academy of Sciences (later the Institute of Mathematical Machines). The team was led by professor Leon Łukaszewicz. XYZ was a laboratory model of a utility machine; the ZAM-2 series was created on the basis of this computer. The logical organisation was modelled on the simplified IBM 701, but the electronics were based on the dynamic flip-flops of the M-20 machine, requiring twice as few lamps. The design of the flip-flops and gates was derived from EMAL, but the vacuum diodes were replaced with germanium ones. The working memory was also derived from the EMAL machine after the improvement. It was a dynamic serial computer that computed in binary arithmetic. The machine initially had no permanent memory, only RAM based structurally on ultrasound delay in a mercury-filled tubes. It was later expanded with a drum memory, an input-output system implemented through a primitive control console and a card reproducer (later a tape reader/perforator). The basic fields of use of XYZ were mathematical calculations, and artillery conversion factors for the needs of the army. Programmer Bogdan Miś wrote a program for entertainment on it in 1960 - a tic-tac-toe game, using an oscilloscope to present the course of the game. XYZ led to his own win or a draw, because the program includes all the strategies for its conduct. Another demonstrative program written for XYZ was an animation of a dog peeing on a tree (also shown on the oscilloscope screen) created for the visit of the film crew, creating material about the first Polish computer.

Specifications

Organization: single-address, dynamic serial computer with circuit control binary arithmetic, notation of numbers sign-module word length: 36 bits speed: 650–4500 additions per second (approximately 1000 average) 250–500 multiplications per second (350 average) Clock generator: approx. 680 kHz memory: mercury working memory: capacity: 2.25 KiB - 512 words (32 pipes of 576 bits) average access time : 0.4 ms drum fixed heads capacity: 36 KiB (64 tracks of 128 words) average access time: 20 ms External devices: reader and perforator card Technology: 400 electron tubes and 2000 diodes

Programming languages internal language of the machine simple PROBIN assembler SAS macroassembler SAKO

References Article was partially translated from Polish wiki article, for original see pl:XYZ.

External links Photo and description PTI Historical Section, Short description of the XYZ-I programmable digital machine Archived 2020-08-07 at the Wayback Machine, historiainformatyki.pl

Illustrations

Worked examples

Example 1 — a first encounter with XYZ (computer)

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

In research: XYZ (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 XYZ (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: XYZ (computer) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1950s computers, Computer-related introductions in 1958, Computers designed in Poland, so understanding it makes those chapters shorter.
In everyday life: Look for XYZ (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.

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How to study XYZ (computer) in 20 minutes

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

Frequently asked questions

What is XYZ (computer) in simple terms?

Why does XYZ (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 XYZ (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 XYZ (computer).