Ps/2: Compatible Mouse Driver

In a protected mode environment (such as x86 architecture), the driver installs an Interrupt Service Routine (ISR) for IRQ12. When the interrupt fires, the ISR reads the status register at 0x64 . If Bit 0 and Bit 5 are set, the data in 0x60 comes from the mouse.

The driver processes this data and sends it to the operating system, which then uses it to update the mouse cursor position, perform actions, and execute commands. ps/2 compatible mouse driver

Understanding PS/2 Compatible Mouse Drivers: A Comprehensive Guide In a protected mode environment (such as x86

Standard PS/2 mice report 3 bytes. However, support for the scroll wheel (IntelliMouse protocol) extends the packet to 4 bytes. To activate this, the driver must perform a specific "magic knock" sequence: ps/2 compatible mouse driver