computer science

NCR 5380

NCR 5380 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 NCR 5380 rather than just read about it. In short: The NCR 5380 is an early SCSI controller chip developed by NCR Microelectronics. It was popular due to its simplicity and low cost.

Key takeaways

NCR 5380 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 NCR 5380 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NCR 5380 from memory before moving on to harder problems.

Reference excerpt

The NCR 5380 is an early SCSI controller chip developed by NCR Microelectronics. It was popular due to its simplicity and low cost. The 5380 was used in the Macintosh Plus and in numerous SCSI cards for personal computers, including the Amiga and Atari TT. The 5380 was second sourceed by several chip makers, including AMD and Zilog. The 5380 was designed by engineers at the NCR plant then located in Wichita, Kansas, and initially fabricated by NCR Microelectronics in Colorado Springs, Colorado. It was the first single-chip implementation of the SCSI-1 protocol. The NCR 5380 also made a significant appearance in Digital Equipment Corporation's VAX computers, where it was featured on various Q-Bus modules and as an integrated SCSI controller in numerous MicroVAX, VAXstation and VAXserver computers. Many UMAX SCSI optical scanners also contain the 53C80 chip interfaced to an Intel 8031-series microcontroller. Single-chip SCSI controller NCR 53c400 used SCSI 5380 core.

Illustrations

NCR 5380: Zilog 5380 on a Media Vision Pro AudioSpectrum with SCSI interface — Zilog 5380 on a Media Vision Pro AudioSpectrum with SCSI interface

Worked examples

Example 1 — a first encounter with NCR 5380

Start with the simplest possible case. Write down what NCR 5380 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 NCR 5380 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 NCR 5380 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 NCR 5380

In research: NCR 5380 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 NCR 5380 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: NCR 5380 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer hardware stubs, Integrated circuits, NCR Corporation products, so understanding it makes those chapters shorter.
In everyday life: Look for NCR 5380 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 NCR 5380 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NCR 5380 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 NCR 5380 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NCR 5380 in simple terms?

The NCR 5380 is an early SCSI controller chip developed by NCR Microelectronics. It was popular due to its simplicity and low cost.

Why does NCR 5380 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 NCR 5380?

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 NCR 5380.