Although the concept was first implemented circa 1966 (as O-code for BCPL and P – a code for the Euler Language), the term p-code first appeared in the early 1970s.
虽然這個概念在1966左右年就已首次实现（于BCPL的O-code与Euler语言的P - a code），但P-code这个词直到70年代初才首次出现。