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HP Forum Archive 21

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Emu41
Message #1 Posted by Richard L. Taylor on 27 June 2012, 9:57 p.m.

Hi all, I was given this small program for the Emu41, by the creater of the Emu41 to read numbers from an ascii text file into the main memory of the Emu41.

34*LBL IMPORT

35 AUTOIO

36 "DOSLINK"

37 FINDID

38 SELECT

39 CLRDEV

40 0

41*LBL 04

42 INA

43 ALENG

44 X=0?

45 GTO 05

46 AVIEW

47 RDN

48 ANUM

49 STO IND Y

50 RDN

51 1

52 +

53 GTO 04

54*LBL 05

55 RTN

56 END

This program works real nice.

Does any one know how to change it to read the numbers from the ascii file directly into an extended memory file?

Thank you in advance.

Rich

      
Re: Emu41
Message #2 Posted by J-F Garnier on 28 June 2012, 3:38 p.m.,
in response to message #1 by Richard L. Taylor

You have to replace the line 49 STO IND Y with SAVEX, and create the extended memory file before or at the beginning of IMPORT, with something like that: 

"MYFILE"
50
CRFLD
0
SEEKPTA

            
Re: Emu41
Message #3 Posted by Richard L. Taylor on 28 June 2012, 4:45 p.m.,
in response to message #2 by J-F Garnier

Thank you so much J-F for the help. I have one more question for you please. Is there a way to list the numbers in the extended memory data file with out putting them back into main memory?

Thanks Rich

                  
Re: Emu41
Message #4 Posted by J-F Garnier on 29 June 2012, 1:13 p.m.,
in response to message #3 by Richard L. Taylor

Well, you can use the GETX function to get the numbers one by one in X register: 

LBL VNUM    (view numbers)
"MYFILE"
0
SEEKPTA
50        (for instance)
LBL 01
GETX
VIEW X
RDN
DSE X
GTO 01

                        
Re: Emu41
Message #5 Posted by Richard L. Taylor on 29 June 2012, 3:17 p.m.,
in response to message #4 by J-F Garnier

Thank you for the help. I am writing a program to have my HP41cx with the help of my HP7470a plotter with the plotter module and my HP9114B disk drive to draw vector based maps of my state of Nevada. Things like the state boundary, the country boundaries, some of the major roads, and the major rivers and streams. The location of most of the cities and towns in Nevada. All the coordinates are in degrees of Latitude and Longitude. I just wanted to show what the little HP41cx can do in the field of Computer Mapping.

Thanks again for your help. Rich

                              
Re: Emu41
Message #6 Posted by Ángel Martin on 30 June 2012, 2:07 a.m.,
in response to message #5 by Richard L. Taylor

Sounds like a nice project, make sure you post the maps when complete - I'm sure you'll enjoy the work.

                                    
Re: Emu41
Message #7 Posted by Richard L. Taylor on 30 June 2012, 1:04 p.m.,
in response to message #6 by Ángel Martin

Thank you for your interest in the project. I have only had some experience in programing in 1977 Fortran. I must say I like programing the HP41cx. Some of my project data files are quite large. For example, highway I80 across northern Nevada has about 1,800 points to plot. I have to break it up into several files of 120 points. I also have to write the program in such a way that I use several subroutines in which I call them up and use them, then delete them form the main program to save memory.

Rich

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