computer science

TLD Systems

TLD Systems 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 TLD Systems rather than just read about it. In short: TLD Systems, Ltd. was an American software company active in the 1980s and 1990s and based in Torrance, California, that specialized in language compilers for the JOVIAL and Ada programming languages that were targeted to embedded systems. TLD was founded by Terry L.

Key takeaways

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

Reference excerpt

TLD Systems, Ltd. was an American software company active in the 1980s and 1990s and based in Torrance, California, that specialized in language compilers for the JOVIAL and Ada programming languages that were targeted to embedded systems. TLD was founded by Terry L. Dunbar in 1982 and carried his initials. It was based on work on JOVIAL compilers he did at Computer Sciences Corporation and Software Engineering Associates, Inc. in the 1970s. Over the years TLD developed a reputation for experience with, and in-depth knowledge of, both the JOVIAL language and the MIL-STD-1750A architecture that was popular for U.S. Air Force projects. TLD hosted its JOVIAL cross-compiler, and several associated tools such as an assembler, linker, simulator, and symbolic debugger, on several platforms including VAX/VMS and later Sun SPARC/SunOS. TLD then entered the new market for the Ada programming language, which the U.S. Department of Defense had designated as the successor to JOVIAL and other special-purpose languages in use by the military. TLD made embedded system Ada cross compilers targeting the MIL-STD-1750A, hosted on VAX/VMS as well as several Unix-based platforms. The Ada compilers shared the same associated tools as the JOVIAL product. TLD also made a native Ada compiler for the Data General MV/32 20000 under AOS/VS II. The Ada software environment was originally thought to be a promising market, with a number of small, new companies seeking to gain a foothold in it. But the Ada compiler business proved to be a difficult one to be in; many of the advantages of the language for general-purpose programming were not seen as such by the general software engineering community or by educators. TLD Systems was still actively marketing its Ada and JOVIAL products up through 1995. Faced with the need to conform to the new Ada 95 standard for the language, in late 1995 TLD announced a joint arrangement with Ada Core Technologies in which that firm's Ada technology would be adapted to work with TLD's other cross-development tools. TLD Systems ceased doing business as such in 1998. Following that a small consulting firm named TLDworks, Inc. came into being with an address in Hermosa Beach, California.

References

Illustrations

Worked examples

Example 1 — a first encounter with TLD Systems

Start with the simplest possible case. Write down what TLD Systems 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 TLD Systems 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 TLD Systems 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 TLD Systems

In research: TLD Systems 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 TLD Systems 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: TLD Systems is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1982 establishments in California, Ada (programming language), Companies based in Torrance, California, so understanding it makes those chapters shorter.
In everyday life: Look for TLD Systems 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 TLD Systems in 20 minutes

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

Frequently asked questions

What is TLD Systems in simple terms?

Why does TLD Systems 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 TLD Systems?

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 TLD Systems.