HP Calculator Wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
====== HP-41CL (replacement CPU board) Project ======

===== Introduction =====

The 41CL is an upgrade to the venerable HP-41, created by replacing the CPU board in a HP-41C/CV/CX [[http://www.hpmuseum.org/collect.htm#variations|"fullnut"]] with a new circuit board.

The **NEWT** (Nut, Expanded With Turbo) microprocessor used in the 41CL provides a number of new features surrounding a clone 
of the CPU originally used in the 41c series. These new features, particularly the Memory Management Unit (MMU), are probably 
more complex than the typical HP-41 user is used to dealing with.

The 41CL attempts to hide this complexity from the typical user, while still providing full control over the hardware to the 
advanced user. This is accomplished by including a special set of functions, much like the Extended Functions present in the HP-41CX.

===== Current Status =====

//Last update: 28-Nov-2017//

<note>Another batch of boards are available. See the project home page (below) for details.
\\

**One word: Amazing!**</note>

<note>The complete [[41cl:library|41CL modules]] list is available now!</note>

   * [[http://www.systemyde.com/hp41/index.html|Home for the 41CL project]], including ordering information


===== Features =====

<box left round green>
The 41CL takes advantage of modern technology to significantly add to the capabilities of
the HP-41 system. In particular, the 41CL provides the following features:
\\

\\
• All features of an HP-41CX except for the Time Module. CX Time functions (the software)
are included, but a Time module plugged into a Port is required for full timer
functionality.

• Full 600-register Extended Memory is built in.

• Roughly 300 plug-in module images are built in. Functions are included to allow these
images to be virtually plugged into a calculator Port and unplugged from a calculator
Port.

• Turbo mode, which allows the calculator to run at up to 50X normal speed. Actual values
available are 2X, 5X, 10X, 20X and 50X.

• 16 empty pages (4K in length) of Flash memory are available for non-volatile storage.

• 121 pages (4K in length) of RAM are available. All RAM is continuously powered.

• A sophisticated Memory Management Unit (MMU) allows full access to the large
physical memory.

• Full bus compatibility for the Ports, allowing the use of any peripheral designed for the
HP-41 system.

• A full-duplex serial port is available when the optional serial connector is used. This
optional connector uses a 2.5mm stereo jack mounted in a blank port cover.
</box>

<box left round blue>
With these features, however, come some drawbacks:
\\

\\
• Power consumption is higher, at least while the calculator is off or in light sleep
(between keystrokes). Where the original HP-41 required about 10uA while off, the
41CL requires about 110uA. This will lead to reduced battery life.

• The original HP-41 could retain memory contents for several minutes while the batteries
were changed. Because of the higher current consumption, the 41CL only retains
the memory contents for a few seconds while the batteries are out. For this reason, you
should probably have an extra battery holder ready to go when changing batteries.

• The advanced technology used in the 41CL is a double-edged sword. The Flash memory,
as well as the programmable logic devices used to implement the NEWT microprocessor,
only guarantee data retention for 20 years.
</box>

===== Pictures =====

   * [[http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv020.cgi?read=186687#186687|Pictures of a 41CL in a tall key 41C body]]

   * [[http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv020.cgi?read=186130#186130|Early HP-41C and capacitor mod for pre-1954Axxxx HP-41C]]

===== 41CL Library =====

   * [[:41cl:library|All 41CL Modules]] -- See what's available!


===== Getting Started =====

   * [[:41cl:replacement_cpu_board:41CL4dummies|41CL for Dummies]] - Start here if everything else fails :)

   * {{:41cl:hhc2010_41cl.pdf|Presentation on the 41CL}} at [[http://hhuc.us/2010/|HHC 2010 conference]]

   * {{:41cl:hhc2011_41cl.pdf|Presentation on the 41CL beta test results of 2011}} at [[http://hhuc.us/2011/|HHC 2011 conference]]

   * {{:41cl:hhc2013_41cl.pdf|Presentation on 41CL dynamic paging}} at [[http://hhuc.us/2013/|HHC 2013 conference]]

   * [[http://systemyde.com/pdf/beta_stat.pdf|Beta test group status information]]

===== Documentation =====

   * {{:41cl:pocket_41cl_qrg_aug_01.pdf|Quick Reference Guide (POCKET VERSION) including CLUTIL_H}} (Mostly out of date)

   * {{:41cl:qrg_manual_august_10_2011.pdf|Quick Reference Manual; a synopsis of emails}} (Historical interest only)

   * [[http://www.systemyde.com/pdf/sy41cl.pdf|Current 41CL calculator manual]]

   * [[http://www.systemyde.com/pdf/cl_extreme.pdf|41CL Extreme Functions manual]]

   * [[http://www.systemyde.com/pdf/cl_memory.pdf|41CL Memory Functions manual]]

   * [[http://www.systemyde.com/pdf/mem_ref.pdf|41CL Memory Reference]] for V3/V4/V5 boards

   * [[http://www.systemyde.com/pdf/mem_ref_v2.pdf|41CL Memory Reference]] for V2 boards

   * [[http://www.systemyde.com/pdf/cl_update.pdf|41CL Update Functions Manual]]

  * [[http://www.systemyde.com/pdf/cl_clone.pdf|41CL Clone Functions Manual]]

Other legacy documentation can be [[http://www.systemyde.com/hp41/manuals.html|found here]] and [[http://www.systemyde.com/hp41/documents.html|found here.]]

===== Technical Information =====

   * [[http://www.systemyde.com/pdf/newt.pdf|Full NEWT technical documentation]] for those desiring to know the most :)


Note: some of the sections below need updated, so feel free to contribute :)

   * [[:41cl:replacement_cpu_board:CL_patches_and_bugs|41CL Flash Contents Documentation]]

   * [[:41cl:replacement_cpu_board:Serial_Communication|Serial port to computer]]

   * [[:41cl:replacement_cpu_board:Memory_address_and_paging|Memory address and paging]]

   * [[:41cl:replacement_cpu_board:CL_ROM_and_Routines|41CL ROM and Routines]]

   * [[:41cl:replacement_cpu_board:Calculator_conversion|Various steps to convert to a 41CL]]

   * [[Updating the HP-41CL flash via HP-IL]]

===== 41CL Discussion Forums =====

The following simple discussion forums have been created for users of the 41CL. All of the forums below are in wiki format, so posting is easy and quick.

If you need to create a new top-level discussion topic, use the "New thread" box below.

<box left round red>
\\
{{threads>.&41clforum}}
</box>

===== Downloads =====

  * No downloads available yet.

===== Code Snippets =====

   * [[:41cl:replacement_cpu_board:Saving_State2Flash|Sample routines for saving calculator state to flash memory]]

   * See also: [[:41cl:cl_rom_and_routines|Current contents of ROM CL_UTILS module]]
HP Calculator Wiki

User Tools

Site Tools

Page Tools
