computer science

RCA 1600

RCA 1600 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 RCA 1600 rather than just read about it. In short: The RCA 1600 is a discontinued 16-bit minicomputer designed and built by RCA in West Palm Beach, Florida and Marlboro, Massachusetts. It was developed to meet the needs of several RCA divisions, including the Graphics Systems Division (GSD), Instructional Systems, and Global Communications.

Key takeaways

RCA 1600 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 RCA 1600 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of RCA 1600 from memory before moving on to harder problems.

Reference excerpt

The RCA 1600 is a discontinued 16-bit minicomputer designed and built by RCA in West Palm Beach, Florida and Marlboro, Massachusetts. It was developed to meet the needs of several RCA divisions, including the Graphics Systems Division (GSD), Instructional Systems, and Global Communications. It was introduced in 1968, and at the time of UNIVAC's purchase of the RCA Computer Division in 1972 the 1600 was estimated to be in use by 40 customers. The 1600 was intended for use in embedded systems, and was retained by UNIVAC and used in products such as the Accuscan supermarket checkout system in the 1970s.

Description The 1600 uses magnetic-core memory with a cycle time on 1.6μsec, structured as words of 18 bits—16 data bits, one parity bit, and one memory protection bit. Four configurations offered memory sizes of 8 K, 16 K, 32 K, and 64 K bytes (4, 8, 16, and 32 KW). Individual words of memory can be protected by setting the associated protection bit. Attempts to store into protected memory are trapped if memory protection is enabled by a console switch. The processor has sixteen 16-bit "standard" registers, eight for each program state. Program state one is used for normal execution, program state two is used for interrupt service routines. Because each state has an independent set of registers, switching states can be done "essentially instantaneously." Register 8 is the instruction counter in both states. If high-speed I/O (cycle stealing) is used, registers 6 and 7 in program state two are used for I/O address and byte count respectively. The architecture defines 29 instructions in three groups. All instructions are 16 bits, must be located on a word boundary, and therefore can be accessed in one machine cycle of 1.6μsec. There are also seven "special" registers serving particular functions which can also be read and written programmatically.

References

External links RCA 1600 Users Guide Preliminary

Worked examples

Example 1 — a first encounter with RCA 1600

Start with the simplest possible case. Write down what RCA 1600 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 RCA 1600 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 RCA 1600 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 RCA 1600

In research: RCA 1600 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 RCA 1600 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: RCA 1600 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 16-bit computers, Computer-related introductions in 1968, Computer hardware stubs, so understanding it makes those chapters shorter.
In everyday life: Look for RCA 1600 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 RCA 1600 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RCA 1600 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 RCA 1600 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RCA 1600 in simple terms?

Why does RCA 1600 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 RCA 1600?

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 RCA 1600.