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New "unknown" HP-71B command discovered.



#4

Hi folks. As I found out in my research of the HP-71B system, there's a non-described function without arguments in the HP-71B ROM.

It's name is "MEMORY" and it returns the number 0 or one for unknown reasons. Maybe this is a check for HP, if the systems memory has been correctly implemented in this particular unit.

You can check it by just starting the system and entering "MEMORY". There are some other functions too: "MEMORY0" - "MEMORY9", but their reason is unknown til now. They all behave like "MEMORY"


#5

Your message being dated April 1st, it's blatantly obvious
it's intended as an "April's Fool" joke.

Anyway, for those people who didn't realize that, and are
puzzled by your "MEMORY" command, let's explain what's
happening: MEMORY is being interpreted by the BASIC line
interpreter as "MEM OR Y".

BASIC looks for a real MEMORY statement. It finds none,
then parses the line. MEM is recognized as a valid numeric
function who returns the amount of available memory. Then,
OR is recognized as a valid boolean operator, and after
that, Y is recognized as a legal variable.

So, the complete MEM OR Y is a perfectly legal expression,
if weird. Of course, MEMORY0 to MEMORY9 are interpreted
likewise, just using variables Y0 to Y9 instead of plain Y.

I saw this old joke many years ago, in a book by Joseph K.
Horn titled something like "Get the most from your HP-71B"
or so.


#6

Yes, you're right. It was an April fools Joke.

I didn't read Joe Horns book. I discovered the function abt. 1985 and fooled a lot of guys then. You can see the correct function, when you enter MEMORY into a program and look at that line afterwards.

Anyway, I got one email from a guy who was surprised by the fact, that there are some undiscovered commands even now.

I also got an email from one person, who already knew it.

You can be sure, that all my other messages here on the board are no meant to be a joke.


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