reactos/drivers/input/sermouse/sermouse.txt

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Following information obtained from Tomi Engdahl (then@delta.hut.fi),
http://www.hut.fi/~then/mytexts/mouse.html
Microsoft serial mouse
Serial data parameters:
1200bps, 7 databits, 1 stop-bit
Data packet format:
Data packet is 3 byte packet. It is send to the computer every time mouse
state changes (mouse moves or keys are pressed/released).
D7 D6 D5 D4 D3 D2 D1 D0
1. X 1 LB RB Y7 Y6 X7 X6
2. X 0 X5 X4 X3 X2 X1 X0
3. X 0 Y5 Y4 Y3 Y2 Y1 Y0
Note: The bit marked with X is 0 if the mouse received with 7 databits
and 2 stop bits format. It is also possible to use 8 databits and 1 stop
bit format for receiving. In this case X gets value 1. The safest thing
to get everything working is to use 7 databits and 1 stopbit when
receiving mouse information (and if you are making mouse then send out
7 databits and 2 stop bits).
The byte marked with 1. is send first, then the others. The bit D6 in
the first byte is used for synchronizing the software to mouse packets
if it goes out of sync.
LB is the state of the left button (1 means pressed down)
RB is the state of the right button (1 means pressed down)
X7-X0 movement in X direction since last packet (signed byte)
Y7-Y0 movement in Y direction since last packet (signed byte)
Mouse identification
When DTR line is toggled, mouse should send one data byte containing
letter 'M' (ascii 77).
Logitech serial mouse
Logitech uses the Microsoft serial mouse protocol in their mouses (for
example Logitech Pilot mouse and others). The original protocol supports
only two buttons, but logitech as added third button to some of their
mouse models. To make this possible logitech has made one extension to
the protocol.
I have not seen any documentation about the exact documents, but here is
what I have found out: The information of the third button state is sent
using one extra byte which is send after the normal packet when needed.
Value 32 (dec) is sent every time when the center button is pressed down.
It is also sent every time with the data packet when center button is kept
down and the mouse data packet is sent for other reasons. When center
button is released, the mouse sends the normal data packet followed by
data bythe which has value 0 (dec). As you can see the extra data byte
is sent only when you mess with the center button.
Mouse systems mouse
Serial data parameters:
1200bps, 8 databits, 1 stop-bit
Data packet format:
D7 D6 D5 D4 D3 D2 D1 D0
1. 1 0 0 0 0 LB CB RB
2. X7 X6 X5 X4 X3 X2 X1 X0
3. Y7 Y6 Y5 Y4 Y3 Y4 Y1 Y0
4. X7' X6' X5' X4' X3' X2' X1' X0'
5. Y7' Y6' Y5' Y4' Y3' Y4' Y1' Y0'
LB is left button state (0 = pressed, 1 = released)
CB is center button state (0 = pressed, 1 = released)
RB is right button state (0 = pressed, 1 = released)
X7-X0 movement in X direction since last packet in signed byte
format (-128..+127), positive direction right
Y7-Y0 movement in Y direction since last packet in signed byte
format (-128..+127), positive direction up
X7'-X0' movement in X direction since sending of X7-X0 packet in
signed byte format (-128..+127), positive direction right
Y7'-Y0' movement in Y direction since sending of Y7-Y0 packet in
signed byte format (-128..+127), positive direction up
The last two bytes in the packet (bytes 4 and 5) contains information
about movement data changes which have occured after data bytes 2 and 3
have been sent.