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HP Forum Archive 17

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HP41CV Check X-Memory?
Message #1 Posted by ems22 on 16 Aug 2007, 3:08 a.m.

Hello, I have a HP41CV with TimeModul, X-Functions and Card-Reader. I just bought a X-Memory-Modul at ebay. How can I check the function of this modul?

Greetings,

Edgar

      
Re: HP41CV Check X-Memory?
Message #2 Posted by Patrick Rendulic on 16 Aug 2007, 7:03 a.m.,
in response to message #1 by ems22

Install the X-Functions module without the X-Memory module.

Type: XEQ ALPHA EMDIR ALPHA, the calculator displays the content of the extended memory and leaves the number of available registers (= X) on the stack.

Install the X-Memory module and type again XEQ ALPHA EMDIR ALPHA. The display shows the new size of the extended memory (= Y).

You should have Y = X + 238

Edited: 16 Aug 2007, 7:14 a.m.

      
Re: HP41CV Check X-Memory?
Message #3 Posted by Raymond Del Tondo on 16 Aug 2007, 7:05 a.m.,
in response to message #1 by ems22

Hello,

just perform EMDIR _without_ the additional X-Mem module,
note the amount of free registers will be returned to the X register.

Then turn off the HP-41, plug the module in,
turn on the calc again, perform EMDIR again.

Then do X<>Y , then - , and you have total of free registers in the X-Memory module.

This amount should be between 234 and 238 registers initially.

HTH

Raymond

            
Re: HP41CV Check X-Memory?
Message #4 Posted by ems22 on 16 Aug 2007, 7:20 a.m.,
in response to message #3 by Raymond Del Tondo

Thank you very much.
EMDIR without X-Memory: DIR EMPTY
EMDIR with X-Memory: DIR EMPTY
Is the X-Memory-Modul defect?

Greetings,
Edgar

                  
Re: HP41CV Check X-Memory?
Message #5 Posted by Les Bell on 16 Aug 2007, 8:02 a.m.,
in response to message #4 by ems22

After XEQ EMDIR, the number of registers available is left in the X register, not the display.

Best,

--- Les
[http://www.lesbell.com.au]

                        
Re: HP41CV Check X-Memory?
Message #6 Posted by ems22 on 16 Aug 2007, 8:48 a.m.,
in response to message #5 by Les Bell

Thank you very much. I think I understood.
I've got the following:
MEMDIR with X-Functions: 124
MEMDIR with X-Function + X-Memory: 362

So everything seems to be ok, or not?


Greetings,
Edgar

                              
Re: HP41CV Check X-Memory?
Message #7 Posted by Geir Isene on 16 Aug 2007, 9:19 a.m.,
in response to message #6 by ems22

Fully OK

                                    
Re: HP41CV Check X-Memory?
Message #8 Posted by ems22 on 16 Aug 2007, 9:42 a.m.,
in response to message #7 by Geir Isene

Thanks again from Hamburg,

Edgar


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