Bushwalk Australia

Calculator: HP-41CX PC & iPhone emulator

Sometimes you need something familiar when number crunching and if you are 'old school' then this is for you...

GPSGuided wrote:No question on the HP-41 and similar. They are just fantastic calculators. Unfortunately mine died a few years ago.

My inner Geekness revealed...

I got my 41C (Coconut) in '85 and then got it refirb'ed to a CX in '89 when HP PPC Calc division was based in Melbourne. The HP wand has disappeared and the card readers drive wheel has since perished, yet you can still get replacements!

I use this 41 pc app on the lappy all the time, as the real 41 lives mainly in it's piggy skin case...

Windows HP-41CX emulator by 'Warren Furlow' works on all PC platforms as a portable:
https://www.educalc.net/326089.page



HP_41cx_EMU_2002.zip download link:
https://doc-00-cc-docs.googleuserconten ... e=download

check it out...

PS: I have 2x as new 48GX's in a drawer ready to be sold off if anyone ever needs one again...

Very retro...

γ = arctan [tan (λ - λ0) × sin φ]

Find that app on your smartphone and forget about clicking with the mouse.

GBW wrote:Very retro...

γ = arctan [tan (λ - λ0) × sin φ]

Yeah that's fine in algebraic but this is 'Reverse Polish Notation' territory buddy!
http://mathworld.wolfram.com/ReversePolishNotation.html



Hence...

Code: Select all

γ = arctan [tan (λ - λ0) × sin φ]

...now, to plug this into the HP goes like this...

φ ENTER sin
λ ENTER λ0
-
tan
x
SHIFT arctan



GPSGuided wrote:Find that app on your smartphone and forget about clicking with the mouse.

here tis...

http://www.hp41.org/Emulation.cfm
http://www.finseth.com/rpnrpl.html




--------------------

HP-41CX apps for iPhone & Touch...

http://www.hp41.org/LibView.cfm?Command=View&ItemID=825
http://www.hp41.org/LibView.cfm?Command=View&ItemID=881

Thanks for this. I don't know how many times I've been out bush walking and thought to myself 'Gee, I wish I had a calculator with me!'

Ha...you really are a geek. Lets try some values in the equation just to be sure your order of operations are correct:

γ = arctan [tan (λ - λ0) × sin φ]

where
λ = 144.946014°
λ0 = 147°
φ = -37.815018°

MickyB wrote:Thanks for this. I don't know how many times I've been out bush walking and thought to myself 'Gee, I wish I had a calculator with me!'

The very reason why I posted this! My maths is ok for map skills but it's just my parenthetic that suffers these days...

GBW wrote:Ha...you really are a geek. Lets try some values in the equation just to be sure your order of operations are correct:

γ = arctan [tan (λ - λ0) × sin φ]

where
λ = 144.946014°
λ0 = 147°
φ = -37.815018°

Code: Select all

γ = arctan [tan (λ - λ0) × sin φ]

where
λ  = STO 01    144.946014
λ0 = STO 02    147
φ  = STO 03    -37.815018

EXQ_RAD RCL_03 SIN RCL_01 RCL_02 - TAN x SHIFT_TAN-1
:_   -0.216948439

EXQ_DEG RCL_03 SIN RCL_01 RCL_02 - TAN x SHIFT_TAN-1
:_   1.259664620



Y=-1.2597

You got it. Nice little app.

Code: Select all


 Meridian := 3 + ( Trunc( Longitude / 6 ) * 6 ) ;
 result := RadToDeg( arctan ( tan( DegToRad( Longitude - Meridian ) ) * sin( DegToRad( Latitude ) ) ) );



GBW wrote:You got it. Nice little app.

Code: Select all


 Meridian := 3 + ( Trunc( Longitude / 6 ) * 6 ) ;
 result := RadToDeg( arctan ( tan( DegToRad( Longitude - Meridian ) ) * sin( DegToRad( Latitude ) ) ) );



Y = 1.2597

HP-48GX for Mac OS X - A free emulator for HP calculators

http://emu48mac.sourceforge.net/

Usable 49G/48GX/48SX/40/39/38 emulation, KML skin support, State Save/Open, Drag and Drop, Copy and paste, Beep (only system beep for now), Debugger, Memory card emulation (for 48SX/GX), plus Greyscale mode.

LOL, nice thread. I still use my HP41CX and the go41c android app. For the real geeks out there, I've got the PPC ROM and the CCD Modules. Got a spare/backup HP41CV somewhere.