This is the most comprehensive technical resource. It includes diagnostic tools, field-replaceable unit (FRU) lists, and instructions for replacing parts like the system board, fan assembly, and PCI adapters. View the ThinkCentre HMM (PDF) at Lenovo Support .
Intel-based (commonly paired with Intel 946GZ or similar series for that era). 43c8358 Motherboard Manual
2x USB 2.0 ports and PS/2 Keyboard/Mouse ports. Expansion: PCI and PCIe slots for adapters. Key Layout Information This is the most comprehensive technical resource
9-pin COM ports and 25-pin D-Sub parallel port. field-replaceable unit (FRU) lists