computer science

Q40 (motherboard)

Q40 (motherboard) 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 Q40 (motherboard) rather than just read about it. In short: The Q40 and Q60 (sometimes known generically as the Qx0 series) are computer motherboards designed in the late 1990s, based on the Motorola 68040 and 68060 microprocessors respectively and intended to be partially compatible with the Sinclair QL microcomputer. Later these were sold as a fully assembled computer in an AT desktop case.

Key takeaways

Q40 (motherboard) 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 Q40 (motherboard) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Q40 (motherboard) from memory before moving on to harder problems.

Reference excerpt

The Q40 and Q60 (sometimes known generically as the Qx0 series) are computer motherboards designed in the late 1990s, based on the Motorola 68040 and 68060 microprocessors respectively and intended to be partially compatible with the Sinclair QL microcomputer. Later these were sold as a fully assembled computer in an AT desktop case.

Hardware The Q40 and Q60 motherboards were designed by Peter Graf of Germany and manufactured by D&D Systems of the United Kingdom. Peter Graf designed it to fit any standard AT form factor computer case, although D&D later sold it as complete, fully assembled computer. The Q40 consists of a sub-AT form factor board comprising a 40 MHz 68040 processor, 1 MiB of video RAM, and several PLDs implementing a QL-compatible video display generator, an ISA bus, stereo 20 kHz audio DACs and an AT keyboard interface. Floppy disk, ATA hard disk, RS-232 and Centronics printer port interfaces are provided by an ISA "multi-I/O" card in one of the two ISA slots provided. Up to 32 MiB of FPM or EDO RAM can be installed in two 72-pin SIMM slots. Also included are sockets for two ROM devices, 2 kiB of non-volatile RAM and a real-time clock. Both of the QL's standard video modes are supported, plus two extended modes: 512×256 or 1024×512 pixels with 16-bit colour. The Q40 board was produced in limited quantities before being superseded by the Q40i; essentially a Q60 board with a 40 MHz 68040. The Q60 became available in 1999. It is a revised board with a 66 MHz 68060 (Q60/66) or 80 MHz 68LC060 (Q60/80) processor and support for up to 128 MiB of RAM. In 2013 Peter Graf announced that he was working on the Q68, a FPGA based QL compatible single board computer. The Q68 was first presented to the public in April 2014 and became available in autumn 2017. It is produced and marketed by Derek Stewart (of former D&D Systems).

Software Three operating systems are available for the Q40/Q60; these comprise QDOS Classic (an enhanced version of Qdos 1.10), SMSQ/E and a custom Linux distribution.

References

External links Official Q40/Q60 website

Worked examples

Example 1 — a first encounter with Q40 (motherboard)

Start with the simplest possible case. Write down what Q40 (motherboard) 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 Q40 (motherboard) 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 Q40 (motherboard) 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 Q40 (motherboard)

In research: Q40 (motherboard) 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 Q40 (motherboard) 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: Q40 (motherboard) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 68k-based computers, Computer hardware stubs, Motherboard, so understanding it makes those chapters shorter.
In everyday life: Look for Q40 (motherboard) 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Q40 (motherboard)” →

Affiliate

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

How to study Q40 (motherboard) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Q40 (motherboard) 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 Q40 (motherboard) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Q40 (motherboard) in simple terms?

Why does Q40 (motherboard) 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 Q40 (motherboard)?

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 Q40 (motherboard).