1. HHC 2017
Update on the HP 41CL
Thanks to Jürgen Keller

2. HHC 2017 Update on the HP 41CL What is the HP 41CL?
Replacement CPU board for fullnut
All HP 41CX functionality except for Time Module
Includes 512 pages (4K) of flash and 128 pages (4K) of ram
Nearly all pages preloaded with every HP 41 rom known, including several dozen written in last few years
Includes 50X turbo mode too

3. HHC 2017 Update on the HP 41CL Why would I want one?
Come on – it’s the 41C
Access to all that prewritten software
Update to the beloved classic machine
Access to new roms nearly every month
Like what?

4. HHC 2017
Update on the HP 41CL
1) Formula Evaluation – Here’s an example.
The Secant method using this module. Use initial guesses in Y, X with the formula in ALPHA. Set flag 10 if you want to see the successive iterations.
01 LBL "SV$"
02 STO$ (00)
03 LBL 00
04 EVALZ
05 X<>Y
06 EVALT
07 "Y-Z*(Y-X)/(Z-T)"
08 EVAL$
09 FS? 10
10 VIEW X
11 RCL$ (00)
12 X#Y?
13 GTO 00
14 END

5. HHC 2017
Update on the HP 41CL
1) Formula Evaluation – allows an “equation library” rom or program that can solve for an unknown in an equation.

6. HHC 2017
Update on the HP 41CL
2) Total Rekall “Warp Core” revision. Adds XEQ+ with an autofill ability.
XEQ+ “S and you can then scroll through options starting with S. When you get to what you want, press XEQ or ASN to act on it.
LAST_F now remembers last 5 operations
Along with functions such as Z<=T?, ?0# XYZ (conditional is stack, data, register not equal to zero?), SELCT and ?CASE, and an emergency five data registers in a special buffer.

7. HHC 2017
Update on the HP 41CL
3) HP67 Fun. At last! Many thanks to Dieter Lefeling and Robert Meyer for help with coding and to Angel for creating a rom from the effort!
Manual 45 page PDF.
Contains games of 11-30, 26/36, Artillery, Battleship, Chess, Chuck-a-luck, Golf, Jive Turkey, Moon Lander, One Arm Bandit, SpaceWar, Star Trek, Tic-tac-toe, Algebraic Operating System, Sum of the digits.
Runs just fine on i41CX+.
67FUN2 is on the horizon. Bowling, Rock/paper/scissors, Follow me, Minefield, Othello, and more.

8. HHC 2017
Update on the HP 41CL
4) Partial Differential Equations. Contains 10 programs to solve some diffusion equations, etc.
5) Differential geometry rom, such as Curvature & Torsion of a Parametric Curve and much more.
6) Solve/Integrate rom. Update adds recursive use of FROOT and FINTG.
7) XROM rom. Mcode routines to pop return stacks, perform a port catalog, raise/lower the curtain, load a byte directly into the program step, and a buffer holding 5 extra data registers.
8) Ladybug rom. 12k. Turns the 41 into a customizable integer binary calculator.

9. HHC 2017 Update on the HP 41CL Roms from PPC Programs:
9) TEST – Test statistics solutions book updated with 3 programs: QUEUE, EGYPT, and LIX (Linear exponential curve fit).
10) PPC9 – PPC Statistics rom.
CPM – critical path method
CF8P – Least squares regression to degree 8
CV+ - Curve fit statistical inference program
Matrix linear regression routines

10. HHC 2017 Update on the HP 41CL What’s next?
New 41CL board with 2X the storage capacity coming.
Auto update (Sylvain)
New roms ? Hoping to get an extended precision rom done from old PPC Programs for 20 digit square root, 105 digit sine, 70 digit squares. Why should Wolfram Alpha have all the fun?
What we need:
1) Someone to install boards for a fee.
2) Someone to update boards for a fee.
Back to our regularly scheduled programming!