IBM 5170 - Motherboard Diagrams
IBM's technical reference for the IBM 5170 contains a lot of diagrams.
Following are some motherboard related diagrams that I have created.
Relationship between CPU/NPU internal clocks
BIOS ROM chips U27/U47 - Diagram 1
BIOS ROM chips U27/U47 - Diagram 2
Keyboard controller chip ( photo )
RTC operation via battery
Shunt block U131