I would venture to say, that the HP versions emulate/simulate their real counterparts exactly where as the other HP calculator copies do not.
The reason is that the HP versions use the same algorithms as the real HP calculators. My guess is that the other versions do not so the answers may vary at times. With the HP versions, the answers will be the same. That's worth something for those who need the accuracy.
The reason is that the HP versions use the same algorithms as the real HP calculators. My guess is that the other versions do not so the answers may vary at times. With the HP versions, the answers will be the same. That's worth something for those who need the accuracy.