Lesson 8 - Input Output Services

Speech synthesizer is an example of input device.

• True

• False

A request to display graphics on screen from an I/O device could be directed to:

• monitor driver

• keyboard driver

• printer driver

• mouse driver

Device drivers are software specific while device controller are hardware specific.

• True

• False

Every IO device has a device controller and device driver to communicate with the operating system.

• True

• False

A ____ transmits all 8 bits of a byte in parallel.

• USB

• Serial Port

• HDMI

• Parallel Port

Consider the IO hierarchy, where Application is at the top and Device is at the bottom of the model. Applications rarely talk to devices directly. Which of the following lists the modules of the hierarchy model in correct order between Application and Device:

• API, IO System, Device Driver, Device Controller

• IO System, API, Device Driver, Device Controller

• API, IO System, Device Controller, Device Driver

• Device Driver, API, IO System, Device Controller

Polling involves the CPU continuously checking the status of a device to see if it needs attention. Interrupts are signals sent by hardware devices to the CPU to request immediate attention.

• True

• Fase

The ____ Controller is a hardware device that allows I/O devices to directly access memory with less participation of the CPU.

• Direct Memory Access

• Polling

• Interrupt

• Random Access Memory

A _____ is a register in the main memory used to hold data generated by an IO device.

• Buffer

• Cache

• Virtual Memory

• RAM

A ____ holds a copy on faster storage of an item that resides elsewhere. It is a temporary memory in the controller or memory.

• Cache

• Buffer

• RAM

• ROM