"The CS implementation is the default implementation as of Racket version 8.0. This variant is called “CS” because it uses Chez Scheme as its core compiler and runtime system." - https://docs.racket-lang.org/reference/implementations.html

Racket Compiler and Runtime Status: January 2021

Note: While the Racket distribution and Chez both support R6RS, #lang r6rs is the Racket implementation of R6RS, and is not Chez Scheme.

https://docs.racket-lang.org/foreign/vm.html

• Running chez after building Racket?

Chez Runner

• https://github.com/Syntacticlosure/chez-runner
• https://pkgs.racket-lang.org/package/chez-runner

Implementation

• Rebuilding Racket onChez Scheme (ExperienceReport)
• Porting Racket to Chez Scheme (Experience Report)