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Writing RPL for the 50g on Linux
09-27-2016, 12:43 AM
Post: #1
Writing RPL for the 50g on Linux
Hello everyone,

I would like to put some equations that I use regularly onto my HP50g in the form of an RPL program on the SD card.

What I would like to do is write the programs on my laptop using emacs, and then put them onto the SD card that way. I've been reading the docs and but there are a couple of gaps in my understanding:
  • Can I actually do this?
  • I would like to have the simplest setup possible. I don't want to have some big fancy-pantsy IDE. I would prefer just to use command-line tools if possible. Can I do that?
  • What format do the programs need to be in when I write them on the laptop? Plain text?
  • Do I have to compile them on the calculator or can I compile them on the laptop and move the binaries over?

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09-27-2016, 09:08 AM
Post: #2
RE: Writing RPL for the 50g on Linux

You can install EMU48 with wine and convert any binary UserRPL in ASCII format to transfer it to SD card and reconvert it in UserRPL on HP 50g, alternatively you can write your programs/equations directly in ASCII format (using ASCII translation symbols) with any text editor as EMACS and send them to SD card as explained in:

Ascii Import/Export for SD card and Emulator (John H Meyers)!msg/co...zxPAvZfk4J

ASCII to Binary Converter (and vice versa)

More commons translation symbols:
Num   Sym   Description
---   ---   -----------
128   \<)   angle symbol
131   \v/   square root
132   \.S   integral symbol
133   \GS   Greek Sigma (\GSLIST)
135   \pi   pi
136   \.d   derivative symbol
137   \<=   less or equal
138   \>=   greater or equal
139   \=/   unequal
141   \->   right arrow (\->LIST, \-> a b c)
142   \<-   left  arrow (\<-local)
143   \|v   down  arrow (\|vMATCH)
144   \|^   up    arrow (\|^MATCH)
156   \PI   capital  pi (\PILIST)
159   \oo   infinity
171   \<<   program delimiters
187   \>>
092   \\    backslash[/quote]

In HP 50g AUR's Appendix J you'll find the complete charater set table:
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09-30-2016, 03:06 AM
Post: #3
RE: Writing RPL for the 50g on Linux
I'm an electrical Engineer, with a specialty in designing radio's.
There are a couple of dozen equations that I use fairly frequently, and
I've programmed them into PEQEM rather than use Excel because of the
numeric solver and multiple equation solver that's built into the 50G.

Asciiflow ( ) is a useful website/drawing tool
that will create ASCII drawing for documentation. While it's not as nice
looking at a GROB, it's a lot faster to put together, and text is all
that PEQEM supports.

Since I like typing on a large keyboard as well, I use a SD card to hold
text files, and translate them on the calculator from ASCII format to
directories and variables. I've also developed a couple of utility
programs to assist with this, and I'll document them here. I use
AsciiBin ( to go from a text
string on the stack to HP50g executable objects. I've renamed
ASCIIBIN.49 to UZ on my calculator, just to make things easier to type.

First, the PEQUM Equation Directory. This is a cut down version of the
one I use, as that one is ~ 20k of ASCII. I use the @ as a comment
delimiter, and try to format equations so that they are readable. This
text file resides in the root directory of the SD Card.

PEQUM is located here , and is
a pretty handy equation library routine.

%%HP: T(3)A(D)F(.);
@ Collected directory of equations for PEQUM.
@ Equations are stored in a directory
@ {Equations}.
@ Constants can enter directly
@ variable$ is a text note Can attach to variables or directories
@ Can also support subdirectories.
@ is a useful website for creating some

@ Start of Directory
"Directory of Receiver Performance
"All powers in dBm
OIP3: Output IP3
Pout: Single Tone Output Power
Pspur: Spurious 3rd order Tone
From RFCafe web site. "
IP3.eq 'OIP3=3/2*Pout-1/2*Pspur'
IIP3.eq 'IIP3=(2.*PD+PA+G-IMD3)/2.'
"Input IP3
IIP3:Input IP3
PD: Input Power
G: Gain
IMD3: IMD3 Power"
RXSense.eq 'RXSense=BBSNR+10.*LOG(1.38E-23*(T+273.15)*BW*1000.*(NFRx))'
"Receiver Sensitivity
RXSense: Receiver Sensitivity,
BBSNR: Baseband SNR at Sensitivity
T: Temperature, C
BW: System BW
NFRx: Receiver Noise Figure"
FriisV.eq 'Ftot=Fm+(Fmp1-1)/gm^2*(1/(Rim/(Romm1+Rim))^2)*(1/(Romm1/Rom))'
"From Gu, Eq. 4.2.20
Fm: Noise Factor, Stage m
Fmp1: Noise Factor, Stage m+1
gm: Stage Voltage Gain
Rim: Input R Stage m
Romm1: Output R, Stage m-1
Rom: Output R, Stage m"
IR.eq 'IR=10*LOG((1+2*(1+A)*COS(P)+(1+A)^2)/(1-(2*(1+A)*COS(P)+(1+A)^2)))'
"IR: Image Reject
A: Amplitude Mismatch, Linear
P: Phase Mismatch"
IRINP.eq 'IRINP=10*LOG(Fc2kT0*LN(f2/f1)+10^(NFth/10)*(f2-f1))+-170.97'
"IRINP: Input Referred Noise Power
Fc2KTO: 1/f Noise Corner
f1: Start Frequency
f2: Stop Frequency
NFth: Stage noise Figure"

LNAFOM.eq 'FOM=(ALOG(G/10)*ALOG(IIP3/10)*f)/((ALOG(NF/10)-1)*P)'
G: Gain(dB)
IIP3: Input IP3(dB)
NF: Noise Figure(dB)
P: DC Power (mW)
f: Center Freq (GHz)
From Yao et al: Algorithmic Design of CMOS LNA's and Pa's for 60 Ghz Radio



In practice, I recall this text file from the SD Card to the stack, and
then run UZ on it, to translate it to a directory. I can then "EVAL"
this, and the object on the stack will purge the old 'EQUATION'
directory and store the new one into the same one. Below is the program
that I use (from the home directory) to pull EQ02.txt and a Notes file.
The Notes File is a simple text file that I display using VV, which is
the text display part from (
When I update either text file on the SD card, I run this utility, which
I've named rclSD, to pull from the SD card and install on the

Recall from the SD Card. Stored in my home directory.


%%HP: T(3)A(D)F(.);
@ Utility to recall directory objects from the SD card
@ and put them into the {HOME DEV} sub directory. Each one of these
@ directory objects will purgedir of the previous version and then
@ store itself into that named variable.
PATH @ Put the Path on the Stack

{HOME} EVAL @ Move to Home
:3:"EQ02.txt" RCL UZ EVAL @ Get Equations directory
:3:"HP50GNotes.txt" RCL UZ EVAL @ Get Notes file

EVAL @ Now I'm done, EVAL the path to get back

Notes on the 50G


%%HP: T(3)A(D)F(.);

\<< "Notes on HP50G Usage
LIBS - Returns list of installed
libaries to stack

50g display size 131x80

Updating the two equation libraries
that I have on the 50g:

Equations are stored in a
directory {Equations}. RPL code
bkupeqn copies the equation to
the SD card, after running uz
on it. File name is eq.txt.
Once this is on a computer,
use EQ01.txt as the human
readable version to edit
and cleanup and then use
uz to recover the directory

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01-23-2017, 01:00 AM
Post: #4
RE: Writing RPL for the 50g on Linux
Thanks for the help, both Smile
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