An additional bit, bit number 5 (value=0x20), indicates that this next byteĬame from the mouse, if the bit is set.

In that byte from port 0圆4, bit number 0 (value=1) indicates that a byte isĪvailable to be read on port 0圆0. To tell if there is any available data on port 0圆0 at all, it is necessary Since both keyboard and mouse data is showing up to be read on port 0圆0, it is necessary to be able to tell Not necessary to handle all of the following things inside the driver, but doing so can make things work faster. If you occasionally poll bit number 0 (value=1) of port 0圆4, to see if data is available on port 0圆0. Way that you will know that mouse data has arrived is if you handle an appropriate IRQ (generally IRQ12), or These packets show up asynchronously as data on IO port 0圆0.Įven though the data shows up on port 0圆0 (the keyboard port), it does not trigger an IRQ1. Movement, and mouse button press/release events. Once a mouse has been initialized (see below), a mouse sends 3 or 4 byte packets to communicate mouse PS2 Mouse - Basic Operation (Microsoft compliant) If you use bochs, and want your mouse to emulate PS2 mouse, you need to edit keyboard & mouse settings and set mouse type to either 'ps2' (this is the mouse without mouse wheel button) or 'imps2' (this is the mouse with mouse wheel button). 'Mouse toggle method' enables you to choose from a list hotkey to switch between mouse capture enabled or disabled. Good idea is to also select the checkbox 'enable mouse capture'. Older technology that is no longer common.Ī USB mouse generally emulates a PS2 mouse, except that it generates IRQs from the USB bus, and not IRQ 12. 1.5.6 Streaming Advantages and DisadvantagesĬurrent PCs generally use PS2 mice, or a similar format that emulates a PS2 mouse.1.5.1 PS/2 Device Unplugging/Hot Plugging.1.4.5.1 Resolution, Scaling and Sample Rate.1.4.5 Additional Useless Mouse Commands.1.4.2 0xD4 Byte, Command Byte, Data Byte.

1.4.1 Waiting to Send Bytes to Port 0圆0 and 0圆4.

1.3.3.3 Formats of Optional 4th Packet Byte.

1.3.3.1 Timing/Generation of Mouse Packets.1.3 PS2 Mouse - Basic Operation (Microsoft compliant).

Ps2 emulator mac keyboard and mouse