Here is a list of all topics with brief descriptions:

Defines - I/O ports
Defines - Interrupt IDs
Defines - Memory layout
Defines - Video memory
Functions - Cartridge/Banking
Functions - DMA
Functions - Display
Functions - EEPROM
Functions - Internal EEPROM
Functions - Keypad
Functions - RTC
Functions - Serial port
Functions - Sound
Functions - System control
Functions - WonderGate