18 Questions
What is the advantage of using I/O instructions over memory read/write instructions?
They are faster
What is the width of I/O port numbers in the 8086 MPU?
16-bits
How many clock cycles are needed to transfer a word to an I/O port?
Two clock cycles
What is the range of port numbers that can be used in Direct I/O?
00H to FFH
What is the purpose of the IO/M signal in the 8086 MPU?
To indicate that the processor is accessing I/O, not memory
What is the maximum number of byte-sized I/O ports that can be addressed in the 8086 MPU?
65536
What is the purpose of the instruction IN AL, 0FEH?
To transfer data from I/O port 0FEH to AL register
What type of I/O is used in the instruction MOV DX, 0A00H; IN AL, DX?
Indirect I/O
What is the length of a normal bus cycle when the CPU is operating at 8 MHz?
500 ns
What is the purpose of the wait state in a bus cycle?
To wait for very slow devices
How many clock cycles does an external device have to produce the data and maintain it on the data bus?
2 clock cycles
What is the purpose of the idle state in a bus cycle?
No bus cycles are required
What is the size of the I/O address space?
64Kbytes
How many bits can a port address have?
8 bits or 16 bits
What is the purpose of isolated I/O?
To use special I/O instructions for I/O
What is memory-mapped I/O?
Using memory addresses for I/O
What is the range of addresses assigned for I/O devices in memory-mapped I/O?
E0000H through E0FFFH
How are I/O devices treated in memory-mapped I/O?
As if they are memory locations
Test your knowledge of I/O data transfer in the 8088/8086 Microprocessor Unit, including memory and I/O interfacing, data types, and more.
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