IBM 5160 - Motherboard Diagrams
IBM's technical reference for the IBM 5160 contains a lot of diagrams.
Following are some motherboard related diagrams that I have created.
RAM bank layout
Reset flow
Clock generation
NMI generation
Data bus - Simplified
Address bus - Simplified
Speaker circuitry - Simplified
Memory layout of BIOS and BASIC
Possible use of speaker connector for digital input
Digital output via pin PB2 of the 8255 chip
RAM parity generation and comparison
Keyboard - Interface circuitry
Keyboard - Startup behaviour (for 05/09/86 BIOS)
Keyboard - Startup behaviour (for 05/09/86 BIOS) - Different keyboards
Generation of CS for U18 ROM
Some 8253 related circuitry
64-256KB motherboard - RAS CAS delay
64-256KB motherboard - CAS and RAMADDRSEL generation
64-256KB motherboard - External address bus to memory address bus
256-640KB motherboard - External address bus to memory address bus
8088 CPU to address bus