It was a cool experiment but I think currently it's deprecated? The presentation slides are very nice and detail and explain a lot of internals.

For more details about the internals of BEAM VM can check out this open source book: https://github.com/happi/theBeamBook

(Online rendered version: https://happi.github.io/theBeamBook/)

This concept of using 32-bit pointers when running in 64-bit addressing mode is similar to the "compressed OOP" (ordinary object pointers) mode of operation in the 64-bit HotSpot Java virtual machine.