Like many other p-code machines, the UCSD p-Machine is a stack machine, which means that most instructions take their operands from the stack, and place results back on the stack.
如很多其他p-code机一样，UCSD p-Machine是一个堆疊結構機器，这意味着大多数指令从堆栈中获取它们的操作数，并将结果放回堆栈上面。