Baud: 1200 or 2400 Data: 7 bits, 1 stop, no parity
In an era dominated by wireless connectivity and plug-and-play USB devices, the "serial mouse" stands as a monument to the early days of personal computing. For retro-computing enthusiasts, IT historians, or technicians maintaining legacy industrial systems, understanding the is essential.
Unlike a modem or null-modem cable, a serial mouse does not use all 9 pins. It uses a subset for power, ground, and quadrature encoding signals. serial mouse pinout
The serial mouse spoke in "packets." Every time you nudged it, it screamed a at 1200 baud . It would tell the computer: "I moved left by 5 units, and my left button is pressed!" .
⚠️ Colors vary widely. Always verify with a multimeter before soldering. Baud: 1200 or 2400 Data: 7 bits, 1
Understanding the exact mapping of these pins is essential for vintage PC restoration, embedded hardware engineering, or building custom serial-to-USB adapters. The Standard DB9 Serial Mouse Pinout
Never forget the DTR (Pin 4) and RTS (Pin 7) provide the power. Without them, your vintage rodent is just a plastic paperweight. It uses a subset for power, ground, and
The : Provides the "negative" power side to juice up the mouse's internal chips. The "Mouse Wars" Protocol
However, a great rivalry existed. used a 3-byte system, while Logitech (and Mouse Systems) sometimes used a 5-byte system. If you had the wrong driver, your cursor would fly into the corner of the screen and stay there, twitching—a digital ghost in the machine. The Great Transition
Serial Mouse (DE-9 Male) Pinout _________________________ | o 1 o 2 o 3 o 4 o 5 | | o 6 o 7 o 8 o 9 | |_________________________|
Understanding the pinout allows you to: