This is the first discussion I have done since I started this group. I know there are many of you that have used this calculator in the past and some may still do.
Whether or not, if it is the real calculator or an emulator on a device.There are PC's and phone emulators in use today for all types for this calculator.
This was one of my favorite calculators as we all saw the three verisons of it.The 41c,cv,and the cx. All three of these were used by NASA in the space programs.
It was the first time that I had used the alphanumeric RPN calculator. This is the most advanced RPN written that consisted of or was using both letters and numerals
in math or programming on the calculator.There may be more data and information or programming than any other calculator sold to the public to this date.
This was a dream come true when surveyors first got their hands on them with the survey Mod Surveying PAC, which plugs into the calculator. Not just surveyors used these
Calculators and there MODS. There is a very large list of mods available, even extra memory and Quad memory mods. There was a large list of accessories available.
Printers, wands and many other peripherals. Even bar code programs. I will talk about these as time goes on. But now I will talk about some of the first steps in using this calculator
in manual mode.Manually using keystrokes to Traverse then Inverse. Without further adieu, here is Traverse.
HP 41CX Traverse manually without statistics registers using storage Registers
1. First store North in Reg.07
2.Next store East in REG.04
3.Next key in Azimuth in Decimal of a Degree then ENTER
4.Next key in Distance,but do not ENTER
5.Next key in P to R......., polar to rectangular
6.Next sto + 07
7.Next X to Y
8.Next sto + 04
9.Next RCL 07=New North
10.Next RCL 04 = New East
Now your ready for the next leg.
And no program used, Traversing with the HP41
Most all RPN calculators can traverse like this or similar in this way.
Now Traversing using Statistics Registers
1. First clear all statistics Reg.,this can be done with a hard key or alpha keys.
This hard Key is a gold key above the X to Y, so shift gold and CL acc. symbol..
Now you are ready, the statistics registers are 11 thru 16 ( I will list them later with their values.)
You will only use two of them that is 11 and 13, (11 is the summation of the X- values.)
(13 is the summation of the Y- values), so 11 will be the Eastings or Dep's and 13 will be Northings or Lat's
2.Now you are ready to store in them,so (5000) sto 11 and sto 13 reg's (as a example.)
If you like also store North in 07 and East in 04 as POB with 13 North and 11 East.
This way you can always RCL, POB or it can be also used as occupied PT.
3. Next key in Azimuth in Decimals of a degree,then ENTER.
4.Next key in Distance,but do not ENTER.
5. Next key in P to R,.......... polar to rectangular
6.Next Key in X to Y.
7. Next key in accumulation + key just above the X to Y key
and the number 1.0 will be in the display, the next time you will see 2.0 and so on.
8.Next recall RCL regs. 11 for the New Easting and regs.13 for the New Northing
9. Now you ready for the next leg of the traverse.
and that is how you can traverse using Statistics Registers.
Now on to Inversing, This is how I was taught. and it can be done different using RPN or algebraically
but this has always work for me. Algebraically the East 1 is subtracted from East 2 and North 1 is subtracted from North 2
in most formulas used but RPN is always backwards to other types of calculators as it seems to me.. But on to it.
1. East 1 or occupied looking at East 2
E1 - E2, so
Key in East 1 ENTER.
2.Key in East 2 do not ENTER.
3. - (minus)
4. North 1 or occupied looking at North 2
Key in North 1 ENTER,
Key in North 2,do not ENTER
6. Now go Polar that is R to P
7.Distance will be in display
8.Next X to Y ,Azimuth will be in display
9.Next add 180 degrees and solved Azimuth will be in Display.
as in 180 +
When using bearings or Azimuth always make sure of your direction.
Most of my Inverse programs use these same steps.
Everyone solves math and writes programs differently.
Next I will show how to write these simple programs.
traversing and Inversing programs on the HP41cx.
And compare them with other RPN Calculators.