Commodore 64 Chipset

U1 – 6526 CIA chip – controls most of the I/O processes and contains as well the internal timer
U2 – 6526 CIA chip – controls most of the I/O processes and contains as well the internal timer
U3 – ROM (BASIC)
U4 – The Kernal
U5 – ROM Character
U6 – SRAM (Static RAM)
U7 – 6510 Processor
U8 – Logic
U9 – U12 – RAM
U13 – U14 – Multiplexor
U15 – Demuliplexor
U16 – Quad Bilateral Switch
U17 – PLA (Programmable Logic Array)
U18 – SID (Sound Interface Device)
U19 – VIC-II – Generates the Y/C video Signals
U20 – Dual Timer
U21 – U24 – RAM
U25 – U26 – Multiplexor
U27 – Logic
U28 – Quad Bilateral Switch
U29 – Logic NOR
U30 – Binary Counter
U31 – Oscillator
U32 – Logic

A great link with more information is https://www.c64-wiki.com/wiki/Motherboard