computer science

SabreTalk

SabreTalk 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 SabreTalk rather than just read about it. In short: SabreTalk is a discontinued dialect of PL/I for the S/360 IBM mainframes running the TPF platform. SabreTalk was developed jointly by American Airlines, Eastern Air Lines and IBM.

Key takeaways

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

Reference excerpt

SabreTalk is a discontinued dialect of PL/I for the S/360 IBM mainframes running the TPF platform. SabreTalk was developed jointly by American Airlines, Eastern Air Lines and IBM. It is known as PL/TPF (Programming Language for TPF). In 1973, Eastern Air Lines' computing division was selling the SabreTalk compiler for US$95,000. SabreTalk programs still run in the British Airways Flight Operations system (FICO) under ALCS, using a commercially available automatic converter to translate SabreTalk programs to C programs. Both the Reservations and Operations Support System (OSS) of Delta Air Lines were developed using both SabreTalk and IBM 360 Assembler. Although development is currently restricted to C++, the majority of Delta's programming platform remained in Sabretalk until recently in the 2010s. Because of the availability of translators from SabreTalk to C and discontinued support by the original developers, several companies are beginning the move away from SabreTalk to purely C-based programs. Code Sample:

References

External links Sabretalk Programmer's Reference Guide (PDF). May 13, 1894. Robinson, Jeff (March 2001). "Moving From SabreTalk to "C" Part 1: How SabreTalk "Procedures" Become "C" Functions" (PDF). ACP/TPF Today. Archived from the original (PDF) on March 26, 2012.

Worked examples

Example 1 — a first encounter with SabreTalk

Start with the simplest possible case. Write down what SabreTalk 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 SabreTalk 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 SabreTalk 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 SabreTalk

In research: SabreTalk 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 SabreTalk 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: SabreTalk is common in secondary-school and first-year university syllabi. It links to neighbouring topics IBM software, Legacy systems, PL/I programming language family, so understanding it makes those chapters shorter.
In everyday life: Look for SabreTalk 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study SabreTalk in 20 minutes

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

Frequently asked questions

What is SabreTalk in simple terms?

SabreTalk is a discontinued dialect of PL/I for the S/360 IBM mainframes running the TPF platform. SabreTalk was developed jointly by American Airlines, Eastern Air Lines and IBM.

Why does SabreTalk 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 SabreTalk?

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 SabreTalk.