computer science

List of ZX80 and ZX81 clones

List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones rather than just read about it. In short: The following is a list of clones of Sinclair Research's ZX80 and ZX81 home computers: ZX80 MicroAce (1980, US) Microdigital TK80 (1981, Brazil) Microdigital TK82 (1981, Brazil) Nova Electrônica/Prológica NE-Z80 (1981, Brazil) ZX81 Official clones Timex Sinclair T/S 1000 (a ZX81 with the same circuit board from the same factory, but with a 2K x 8 RAM chip instead of 1K and small keyboard mask/character set changes…

Key takeaways

List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of List of ZX80 and ZX81 clones from memory before moving on to harder problems.

Reference excerpt

The following is a list of clones of Sinclair Research's ZX80 and ZX81 home computers:

ZX80 MicroAce (1980, US) Microdigital TK80 (1981, Brazil) Microdigital TK82 (1981, Brazil) Nova Electrônica/Prológica NE-Z80 (1981, Brazil)

ZX81

Official clones Timex Sinclair T/S 1000 (a ZX81 with the same circuit board from the same factory, but with a 2K x 8 RAM chip instead of 1K and small keyboard mask/character set changes. This is typically a U.S. model, with a VHF NTSC RF modulator and slightly improved RF shielding, but are the same BASIC machine) Timex Sinclair T/S 1500 (a TS1000 in a ZX Spectrum like case with 16k built-in) Lambda Electronics Lambda 8300 (a 1983 clone, also branded as PC 8300, DEF 3000, Basic 2000, Marathon 32K, Tonel PC, Unisonic Futura 8300, PC-81 Personal Computer, CAC-3, Polybrain P118, Creon Electronics Power 3000 or NF300 jiaoXueDianNao)

Brazilian clones Microdigital TK82C (smaller case and 2K RAM, 1981) Microdigital TK83 (same case as original, but golden instead of black, 1982) Microdigital TK85 (ZX Spectrum case and 16K or 48K RAM, 1983) Prológica CP-200 (inverted video and larger case, 1982) Prologica CP200S cdSE Microcomputadores Apply 300 Ritas do Brasil Ringo R470 (1983) Nova Electrônica/Prológica NE-Z8000 (1982) Engebrás AS-1000 (1984)

Argentinean clones Czerweny CZ 1000 (1985) Czerweny CZ 1500 (1985) Czerweny CZ 1000 plus (1986) Czerweny CZ 1500 plus (1986)

South Korean clones Samsung SPC-300 GoldStar FC-30 Boeun Peek PC-1000 (Timex Sinclair 1000 compatible, 1983)

Chinese clones PZ-80

Modern clones In recent years retrocomputing enthusiasts created various clones or recreations of the ZX80/ZX81.

Grant Searle reproduction ZX81+38 ZX80/ZX81 Double Clone and related ZX80/ZX81 Project ZX97 Minstrel Wilco/Baffa's one TELLAB TL801, an Italian clone designed in 2002 that can emulate both the ZX80 or ZX81. Selection between machines is made via a jumper.

References

External links

Planet Sinclair: Computers: Clones and Variants Sinclair Nostalgia Products — Sinclair Clones

Illustrations

Worked examples

Example 1 — a first encounter with List of ZX80 and ZX81 clones

Start with the simplest possible case. Write down what List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones

In research: List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones 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: List of ZX80 and ZX81 clones is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer hardware clones, Computer hardware stubs, Lists of computer hardware, so understanding it makes those chapters shorter.
In everyday life: Look for List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is List of ZX80 and ZX81 clones in simple terms?

The following is a list of clones of Sinclair Research's ZX80 and ZX81 home computers: ZX80 MicroAce (1980, US) Microdigital TK80 (1981, Brazil) Microdigital TK82 (1981, Brazil) Nova Electrônica/Prológica NE-Z80 (1981, Brazil) ZX81 Official clones Timex Sinclair T/S 1000 (a ZX81 with the same circu…

Why does List of ZX80 and ZX81 clones 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 List of ZX80 and ZX81 clones?

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 List of ZX80 and ZX81 clones.