Input / Output Ports
The FDC has three I/O ports. These are:
- Data port
- Main status register (MSR)
- Control port
The first two reside inside the FDC IC while the Control port is in the external hardware. The addresses of these three ports are as follows.
Port Address |
Port Name | Location | Port Type |
---|---|---|---|
3F5 | Data Register | FDC IC | Bidirectional I/O |
3F4 | Main Status Register | FDC IC | Input |
3F2 | Digital Control Port | External Hardware | Output |
Read more about this topic: Floppy Disk Controller
Famous quotes containing the words input, output and/or ports:
“Family life is not a computer program that runs on its own; it needs continual input from everyone.”
—Neil Kurshan (20th century)
“Lizzie Borden took an axe
And gave her mother forty whacks;
When she saw what she had done,
She gave her father forty-one.”
—Anonymous. Late 19th century ballad.
The quatrain refers to the famous case of Lizzie Borden, tried for the murder of her father and stepmother on Aug. 4, 1892, in Fall River, Massachusetts. Though she was found innocent, there were many who contested the verdict, occasioning a prodigious output of articles and books, including, most recently, Frank Spierings Lizzie (1985)
“O polished perturbation! golden care!
That keepst the ports of slumber open wide
To many a watchful night.”
—William Shakespeare (15641616)