The KBC1126-NU is a with an integrated Keyboard and Mouse Controller (KBC) . It is specifically designed for portable and desktop systems based on the Intel 486, Pentium, and early Core architectures. The "-NU" suffix typically denotes a TQFP (Thin Quad Flat Pack) package with a specific temperature range (0°C to +70°C commercial grade).
⚠️ Beware of "preliminary" or "brief" datasheets missing key timing diagrams. The full datasheet is ~140 pages. kbc1126-nu datasheet
However, here’s what is likely:
The KBC1126-NU is configured via (index/data pair at 0x2E/0x2F or 0x4E/0x4F, SMSC standard). Key logical devices (LDNs) include: The KBC1126-NU is a with an integrated Keyboard