The linked github looks like a compiler written in C to a virtual machine written in C to me. Slightly sad it isn't self hosted, sometimes you get a VM in C and

The linked github looks like a compiler written in C to a virtual machine written in C to me. Slightly sad it isn't self hosted, sometimes you get a VM in C and the compiler in the language itself. Found some other implementations under https://iolanguage.org/links.html https://iolanguage.org/links.html. None claim to be complete or working, one link was dead :(