Computer Science · May / June 2026 · Paper 11 · Question 4

0478

As printed in the paper

The question as text

An optical mouse is connected to a computer using a universal serial bus (USB) cable.

Read automatically from the paper; the printed page above is exact.

Show the answer and mark scheme

4(a)[1]
One from:
To input data // interact with/navigate the computer/interface
To control/move the cursor on the screen
To act as a pointing device/pointer
To allow the user to click/select/choose/drag (items on the screen) // by example
To scroll through different pages/a page
4(b)[4]
Four from:
(Serial) transmits the data one bit at a time
… down a single wire/channel/line
(Half-duplex) transmits the data (between the computer and the mouse) in both directions/ways …
… but only one direction/way at a time
4(c)[2]
Two from:
Cannot plug the cable in the wrong way round
Different data transmission speeds are supported
High/adequate speed of data transmission
Universal connection/standard
Connection is backwards compatible
It will power the mouse // It will charge the mouse (if it has wireless capabilities)
The mouse will be automatically detected // Mouse drivers will be automatically downloaded // plug and play
Unlikely to have interference/crosstalk
4(d)[4]
One mark for each correct function name or role
function
role
providing an
To allow a user to communicate/interact interface
with the computer/device/system managing memory
It makes sure that two processes do not access the same memory location at the same time. managing interrupts
Checks the source of the interrupt
Assigns/checks interrupt priority // Finds highest priority interrupt // Decides which interrupts to action
Controls/checks the interrupt queue
Calls/uses the interrupt service routine/ISR managing (user)
It allows the user to set a username and accounts //
password.
providing/managing
(system) security

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