computer science

Lisp Machine Lisp

Lisp Machine Lisp 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 Lisp Machine Lisp rather than just read about it. In short: Lisp Machine Lisp is a programming language, a dialect of the language Lisp. A direct descendant of Maclisp, it was initially developed in the mid to late 1970s as the system programming language for the Massachusetts Institute of Technology (MIT) Lisp machines.

Key takeaways

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

Reference excerpt

Lisp Machine Lisp is a programming language, a dialect of the language Lisp. A direct descendant of Maclisp, it was initially developed in the mid to late 1970s as the system programming language for the Massachusetts Institute of Technology (MIT) Lisp machines. Lisp Machine Lisp was also the Lisp dialect with the most influence on the design of Common Lisp. Lisp Machine Lisp branched into three dialects. Symbolics named their variant ZetaLisp. Lisp Machines, Inc. and later Texas Instruments (with the TI Explorer) would share a common code base, but their dialect of Lisp Machine Lisp would differ from the version maintained at the MIT AI Lab by Richard Stallman and others.

Manual The Lisp Machine Manual describes the Lisp Machine Lisp language in detail. The manual was popularly termed the Chine Nual, because the full title was printed across the front and back covers such that only those letters appeared on the front. This name is sometimes further abbreviated by blending the two words into Chinual.

Traits Lisp Machine Lisp features include:

Support for object-oriented programming via an object system named Flavors Uses dynamic binding, but supports closures with a special construct Integer numbers were read and printed in octal (base 8) by default Dividing floating point numbers returned decimals, dividing integers returned rational numbers (fractions)

References

Worked examples

Example 1 — a first encounter with Lisp Machine Lisp

Start with the simplest possible case. Write down what Lisp Machine Lisp 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 Lisp Machine Lisp 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 Lisp Machine Lisp 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 Lisp Machine Lisp

In research: Lisp Machine Lisp 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 Lisp Machine Lisp 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: Lisp Machine Lisp is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1970s software, Lisp (programming language), Lisp programming language family, so understanding it makes those chapters shorter.
In everyday life: Look for Lisp Machine Lisp 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 Lisp Machine Lisp in 20 minutes

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

Frequently asked questions

What is Lisp Machine Lisp in simple terms?

Why does Lisp Machine Lisp 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 Lisp Machine Lisp?

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 Lisp Machine Lisp.