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.
RAM bank layout on type 1 motherboard
RAM bank layout on types 2 and 3 motherboard
Reset flow
Clock generation
Relationship between CPU/NPU internal clocks
BIOS ROM chips U27/U47 - Diagram 1
BIOS ROM chips U27/U47 - Diagram 2
Keyboard controller chip ( photo )
A20 gate
RTC operation via battery
Shunt block U131
Generation of signal for CE pin on U27 and U47 ROMs
Data buses (simplified)
NMI enabled or disabled