This is typically a 13-pin or 14-pin proprietary header. A common pin mapping for Lenovo ThinkCentre boards includes: Pins 1-2: HDD LED Pins 6-8: Power LED Pins 10-12: Power Switch
1x PCIe x16, 1x PCIe x1, and 2x standard PCI slots. Where to Find the Official Manual lenovo is7xm rev 1.0 motherboard manual
1x 9-Pin Serial (COM) port and an internal header for a Parallel (LPT) port. This is typically a 13-pin or 14-pin proprietary header
The rear I/O panel provides robust connectivity for its era: 1x DisplayPort and 1x VGA (D-Sub) port. USB: 4x USB 3.0 ports and 2x USB 2.0 ports. Network: 1x RJ-45 Gigabit Ethernet port. 1x PCIe x1
You can download the comprehensive guide for the ThinkCentre M92/M92p or ThinkCentre M82 directly from the Lenovo Support Documentation Center .