What is I/O Modules and its types?

I/O modules allows for communication between a computer system and a peripheral device.

Types of I/O Modules

Isolated I/O

• When building a computer system based on these processors, the designer has the option of connecting I/O devices to use the special I/O address space.
• Separate in and out instructions to perform I/O transfers.
• Separate memory and I/O select lines needed.

Memory Mapped I/O

• This technique simply incorporates I/O address space as part of memory address space.
• We can see memory addresses are divided and allows I/O devices to have some addresses.
• In memory mapped I/O same machine instructions used to access both memory and I/O devices.

Interrupts Driven I/O

In interrupt driven I/O, we can arrange for the I/O device to alert the processor when it becomes ready. It can do so by sending a hardware signal called on interrupt to bus control line usually dedicated called a interrupt request line.

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