The Intel® 82801DBM, also known as ICH4-M, is a mobile I/O Controller Hub designed for Intel chipsets supporting Pentium M processors. Part of the Intel 855 chipset family, it manages key functions like USB 2.0, IDE, LPC, and audio interfaces, along with ACPI power management. ICH4-M also includes integrated LAN and support for PCI bus mastering. Optimized for notebooks, it provides efficient connectivity and lower power consumption, contributing to compact, high-performance mobile computing platforms in early 2000s laptops.