quartz/content/notes/000 This Semester/002 Courses/Computer Interface/Chapter - 1/IO Instruction.md

IO Instruction

Def:: I/O instructions enables computer's ==I/O== to give and recieve data from the Periferal Devices

• Every microprocessor has instruction to give and read io device information.
• For this reason, 8086 has ==IN== and ==OUT== instruction to recieve and give repectavly.
• The port number is specfied along with IN and OUT instruction.
• Both instruction uses register ==AL or AX== to ==transfer data==.
• The IO address is stored ::: in DX register.

1. Classification According to transfering data type.

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There are two types of I/O instruction

1. Those that transfer single item
2. Thos that transfer a string of item