BeamRacer
How to identify C64 and SID model | ilesj's blog
CIA - C64-Wiki
Commodore 64 Central Processing Unit (CPU) Replacement - iFixit Repair Guide
The Orange Cartridge by Marcus Comstedt — Kickstarter
Chips
The Dual-Core, ARM-Powered Commodore 64 | Hackaday
MJK's Commodore Hardware Overview: Commodore 64
Monotech's MOS CPU Replacer Turns a Humble 6502 Into a Drop-In 6510, 6510T, 8501, 8502 Equivalent - Hackster.io
CSG 8500 CPU for the Commodore 64 (New Old Stock) - Retro 8bit Shop
SuperCPU - C64-Wiki
Commodore 64 - Wikipedia
C-64 Workshop / Chips
C64 Reloaded Precision – breadbox64.com
Raspberry Pi Pico Becomes Commodore 64 Cartridge | Tom's Hardware
Commodore 64: how to repair it, step by step
