What is the end of this cable?
In the below image (from here), the "left" end (which I have labeled "A") is clearly two PS/2 ports.
What is the "right" end (which I have labeled "B")?
Does it connect directly to a motherboard?
The above is apparently Lenovo part number 43N9149, but I haven't been able to find an actual specification sheet for this part -- only third-party seller listings on Amazon, eBay, and the like.
ADDENDUM
I need to be able to use a PS/2 mouse with a Lenovo ThinkStation that I am considering. The particular system I am considering does not have a built-in PS/2 port, but Lenovo sells the above part as an add-on. The problem is, on my existing desktop (not Lenovo) I have tried external USB to PS/2 adapters (dongles) from third-parties, and I have experienced a significant latency issue when I connect a mouse to it. I mean, cursor movement on my screen significantly and noticeably lags the physical movement of my mouse with such external dongles. I'm hoping that the "B" end above has a faster connection than an external USB connection would have.
35 Answers
B-end is a Lenovo-specific 7-pin PS/2 connector, which you connect straight to Lenovo motherboard. See 3rd image from this auction for the details:
2This 7-pin connector goes to a header on a Lenovo motherboard marked KB/MS (keyboard/mouse), specifically for interfacing the motherboard to PS/2 ports.
According to the Lenovo forums, the pinout is as follows:
/-------\
|4|3|2|1|
| |7|6|5|
\-------/
Pin 1 - 5V
Pin 2 - CLK
Pin 3 - Data [5V]
Pin 4 - GND
Pin 5 - 3.3V
Pin 6 - GND (noisy)
Pin 7 - Data [5V]There is no official spec available.
It is the keyboard / mouse port for the computer. Yes, port B connects directly to the motherboard. Depending on the age of the computer, it could either connect to a USB connector or to serial controllers for the keyboard and mouse.
2Looks like a USB internal connector. It should connect to the motherboard in the same header as what you would connect the 'front' USB on your case.
Though, given that it is a lenovo specific adapter, it could be specifically designed for a motherboard in one of their machines. Just check that the pins lines up (there's a covered over hole on the adapter and a missing pin on the headers, they should line up.)
6/-------\
|4|3|2|1|
|X|7|6|5|
-------/
Pin 1 - 5V (Keyboard & Mouse)
Pin 2 - Keyboard CLOCK
Pin 3 - Keyboard Data
Pin 4 - GROUND (Keyboard & Mouse)
Pin 5 - No connection
Pin 6 - Mouse CLOCK
Pin 7 - Mouse Data
Pin X - Connector Orientation KEY
Keyboard & Mouse mini-DIN-6 pinouts from
Built from scrap parts and it works.
1
