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bios
CMOS setup
BIOS
Most serial and parallel ports today connect directly to the motherboard, and the COM and LPT assignments are made in CMOS setup. The ports can also be enabled and disabled in CMOS settings.The short answer is CMOS Setup A+ Guide to Hardware: pg. 396
Most cases have the motherboard ports in the back that way you can hide all the cables and keep them away from alot of activity that may disconnect them.I have not seen a PC with front motherboard ports. But i think its better to leave those ports where they are :)
do you mean "motherboard I/O ports"? Eg. USB, PS/2, Serial, Parallel...
The input ports of a motherboard typically include USB ports, audio jacks, HDMI or DisplayPort for video output, and Ethernet ports for network connectivity. Additionally, some motherboards feature legacy ports like PS/2 for keyboards and mice, as well as connectors for various internal components such as hard drives and optical drives. These ports facilitate communication between the motherboard and peripheral devices.
The motherboard.
UART
Most motherboards come with at least six USB ports..
Expansion ports to the rear.
PCI-E 16x