Problems in writing an interpreter

I am designing an interpreter for a special language from scratch (I,
though, did read in some articles that that's a bad idea, anyways). I
have parsed the input script with flex and bison. Then, I need to
generate the virtual machine. I tried my hand at vmgen but found it
bit difficult to understand. Are there any simpler tools available for
the same? Any pointers in desigining the interpreters are always
welcome.
[It's not very hard to write an interpreter for an RPN token string by
hand. That's plenty to fool around and see how you like your
language. -John]

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