HP-12C gets 'Entry-RPN' or Error in the QSG?

[Joe Horn]

(07-05-2014 07:41 AM)Les Bell Wrote:  

(07-05-2014 04:33 AM)Joe Horn Wrote:  In your example, the ENTER does NOT follow an operation (as specified by HP's doc) but rather follows a numeric entry (which is NOT the situation they were talking about). In my example, it DOES follow an operation. HP's doc is correct.

That's not the way I see it - the intention, rather, is that number entry into the X register can be terminated by either ENTER or an operation. In other words, what's at issue is what follows the number.

Why do you say you disagree when we are saying exactly the same thing? To wit:

2 ENTER 3 + ENTER 4 +
The underlined ENTER is optional, because it follows an operation. This is true of EVERY HP RPN calculator, and it's exactly what HP's doc said (repeat: "Pressing ENTER is optional after entering a number, if the next key pressed is an operation.")

In other words, all they are saying is this:

In "Operation [ENTER] Number", the ENTER is optional.

... and that's correct for every HP RPN calculator.

Quote:The only time ENTER would follow an operation is when you want to duplicate X on the stack.

Not true. That's the only time that you MUST press ENTER, but it's not the only time it's allowed. It's optional (albeit unnecessary), as seen above... and that's all that HP was saying.