In demos the Transmeta processors was shown to support multiple instruction sets - per https://en.wikipedia.org/wiki/Transmeta#Code_Morphing_Software https://en

In demos the Transmeta processors was shown to support multiple instruction sets - per https://en.wikipedia.org/wiki/Transmeta#Code_Morphing_Software https://en.wikipedia.org/wiki/Transmeta#Code_Morphing_Softwa... , they demoed pico-Java , and also there were rumors of PowerPC compatibility. Although you're probably right - none of those options made it into a shipping product, only x86.