0x3F6
0x3F6 is a hexadecimal I/O port address used in the architecture of IBM PC compatibles. In decimal terms, it equals 1014. On traditional x86 systems it is associated with the primary IDE (ATA) controller and serves as the Alternate Status Register (read) and the Device Control Register (write).
The Alternate Status Register at 0x3F6 provides status information about the IDE controller without using the
In modern systems, legacy I/O ports for IDE are often preserved for compatibility or emulated in virtualization,
Summary: 0x3F6 is a key legacy I/O port in PC hardware, primarily tied to the primary IDE