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IBM 550

IBM 550 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 IBM 550 rather than just read about it. In short: The IBM 550 numerical interpreter was the first commercial machine made by IBM that read numerical data punched on cards and printed it across the top of each card. The 550 was introduced in 1930.

IBM 550 — main illustration
IBM 550 — illustration

Key takeaways

  • IBM 550 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 IBM 550 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of IBM 550 from memory before moving on to harder problems.

Reference excerpt

The IBM 550 numerical interpreter was the first commercial machine made by IBM that read numerical data punched on cards and printed it across the top of each card. The 550 was introduced in 1930. Information to be printed could be placed in any sequence via plugboard control panel selections. The machine operated at the rate of 75 cards a minute. The feed hopper had a capacity of 800 cards, and the stacker had a capacity of 1,000 cards. Alphabetic and numeric characters could be printed by the Type 552 alphabetic interpreter, announced in 1937. It could process 60 cards per minute. The Type 552 was withdrawn in December 1957.

References

http://www.columbia.edu/acis/history/interpreter.html

See also Unit record equipment IBM 557 Alphabetic Interpreter

Illustrations

IBM 550: Punched card phone bill with interpreted data
Punched card phone bill with interpreted data

Worked examples

Example 1 — a first encounter with IBM 550

Start with the simplest possible case. Write down what IBM 550 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 IBM 550 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 IBM 550 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 IBM 550

In research
IBM 550 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 IBM 550 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
IBM 550 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer hardware stubs, IBM punched card hardware, IBM unit record equipment, so understanding it makes those chapters shorter.
In everyday life
Look for IBM 550 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 IBM 550 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what IBM 550 means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain IBM 550 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IBM 550 in simple terms?

The IBM 550 numerical interpreter was the first commercial machine made by IBM that read numerical data punched on cards and printed it across the top of each card. The 550 was introduced in 1930.

Why does IBM 550 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 IBM 550?

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 IBM 550.

Tags

  • Computer hardware stubs
  • IBM punched card hardware
  • IBM unit record equipment

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