Time Value Money program for HP 42s
#1

I've restored my old programs back on my HP 42s, after they were erased when it malfunctioned recently.

I also decided I would like to program in the Time Value Money program from pages 192/193 of the HP 42s user manual, but it doesn't work. I've checked out my configuration to the manual's example, and can find no errors on my part.

Maybe this particular program was one of the ones that I have read about as being erroneous on HP's part in their user manuals?

If somebody knows of any corrections, would they be kind enough to post them.

Thanks in advance —John D

#2

Hi John,


Quote:
I also decided I would like to program in the Time Value Money program from pages 192/193 of the HP 42s user manual, but it doesn't work. I've checked out my configuration to the manual's example, and can find no errors on my part.

I just entered it and it seems to work fine with the example given. When you say it doesn't work, could you give me an example of data you're entering and I'll enter it here to see if it works.

I used the Edition 4 March 1990 manual.

Bill

#3

Hi John. I did the same thing on my 42 a while ago, and I found that while the example from the manual worked, when I tried to solve for some FV and time values, the answers were all over the map.

I did double check the data entry, and it is entered correctly. Having said that, the program is very fussy when it comes to input data.

I have not yet gotten good agreement between the program and my 12C. I haven't looked at the problem for a while, but perhaps tonight I'll dig my 42 out and go through it again.

#4

Please, let me recommend this version. It is almost as accurated as a HP 12c. And if you want to know what is going on there, read this version for the HP35s.

Regards,

Miguel

Edited: 25 Aug 2007, 4:17 p.m.

#5

Thanks for the responses,
My manual is the 7th edition 1992. The TVM program is on page 193, and I think the problem may be with line 14 STO ST T

The HP 42s catalog has no ST T, and if I type the letters in, they appear as “ST T” with quotation marks around them, whereas the manual shows no quotation marks.

Doing the problem at the end of the program, the PV and PMT come up with the same result of 5750, in the case of PMT it is -5750. As the ST T doesn't appear in the catalog, I figure that's where the problem lies.

I am not an academic, and use the calc for construction and office work, so I'd appreciate any help given. :)

#6

To enter a STO ST T instruction, press STO, then the decimal point. That brings up a menu which allows indirect storage as well as storage into the stack and the Last X registers. Stack T is the last one on the right.

#7

Thanks Jeff for clarifying that, The program now gets the same answer as the example given in the manual. Also, many thanks to all the others who responded—John D



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