The following warnings occurred:
Warning [2] Undefined array key 23583 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23586 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23596 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23598 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23624 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23625 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23636 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23644 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23646 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $thread - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $fid - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 23646 - Line: 331 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 331 errorHandler->error_callback
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 304 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $theme - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $theme - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $lang - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 5 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Attempt to read property "messages_in_thread" on null - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 5 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks





HP-41C/CV/CX ROM Revisions



#10

I was reading my copy of EXTEND YOUR HP-41 by W Mier-Jedrzejowicz, pages 639-642, ROM Revisions . I wanted to check the ROM revisions on my HP-41's.



The HP-41 is a 64K computer, divide into 16 4K pages of ROM. The most significant digit of the 4-digit hexadecimal address is the page, i.e., the system ROM's begin at adresseses 0000, 1000 and 2000. The TIME module begins at 5000, the printer at 6000, the HP-IL at 7000. The lower and upper ports start at 8000 (lower Port 1) through F000 (upper port 4).



The ROM revision letter is a single letter located at xFFE in each ROM where x corresponds to the page 0 through F.



One way to check this is the following:




1. Assign STO b to a key. The PPC ROM function MK works. Use 145, 124, -12 to assign it to the shifted B key.



2. create the nonnormalized number 00000000xFFD, where x is the RO<M page of interest (0, 1 or 2 for system ROMs).



3. Go to any program in any ROM, for example if MATH pac is installed GTO "SINH".



4. Press key where STO b is assigned.



5. Press SST and keep it down. You should see the next program step. LBL 00 corresponds to a revision A, LBL 01 to revision B, and so on to LBL 14 which corresponds to O.



Here are the System ROM versions for ROM pages 0, 1 and 2:

ROM's  Date Codes    Comments
----- ---------- ----------------------
DDE 1926-1940 All classical bugs
FDE 1936-1952 Bug 3 removed
FEE 1951-2034 Bug 1. 2. 4 removed as well
GFF 2035-84?? Bug 5, 7, 8 removed too. The first version of the H-41CV
HFF 84??-present The current versionm of the HP-41CX
NFL 2329-present Current version of the HP-41CX




Again from page 632 Revision numbers are not always changed, even when small changes are made to the instructions in a ROM. The HP-41CX revision numbers have not been changed, though a number of changes have been made to the reset code (what happens when you press ON while holding down ENTER and backarrow). Even the change in the turn-on code which makes it possible to do a MEMORY LOST when you have a zero length buffer did not merit a new revision number.




My Question - finally


How can I tell which version of HP-41CX I have, since the revision letters have not changes? Are there more that two releases of HP-41CX operating systems? Does anyone else care? Tools I have to look at ROMs are CCD Module, PPC ROM, ZENROM, HEPAX Module, and others.



Best Wishes,

Chris


#11

Dear Chris,
I think you have to compare each ROM. Studying disassembled listing is a good solution. I use an Eprom copy of a service module and when I turn one of my HP-41s, it beeps and shows the followings messages:
CPU OK
SELECT CPU
I press '-' and I get:
ROM 0:N 1:F 2:L

If you practise MCode, those three letters come from codes at addresses 0FFE, 1FFE and 2FFE.

Yours.


#12

I am pulling out those digits, but W. Mier-Jedrzejowicz says that " the HP-41CX revision numbers have not been changed, though a nunber of changes have been made" (Page 642).

Perhaps the ROMs have a checksum digit such that:

(sum of all bytes in the 1K page) modulo (256) = HH

where HH is a constant two digit hexadecimal number and is the same for all ROMs.

Did HP code it this way? Can I examine a specific CHECKSUM byte (what address) in search of at least identifying that one 41CX is the same or different from another?


#13

Dear Chris,
Here are the displays I was talking about.
After pressing 'ON':


After key '-' for instance:

Codes from 2 different HP-41CX:
Fullnut 0FFF 08C
1FFF 0C0
2FFF 1B9
Halfnut 0FFF 08C
1FFF 0C0
2FFF 1B9
XFFF is a rom checksum.
They are both NFL version?!

#14

I have checked three 41CX's with the same result.

Reference the original message. I found one 41C, S/N 2048A01265 that has:

ROMs  DATE CODES  COMMENTS
---- ---------- -----------------------------
GEF 2049 GOLD BALL CONTACTS AT BATTERY
TUNNEL. BUGS 1,2,4 REMOVED.
BUG 7 PRESENT

Has anyone seen these three system ROMs togther?


#15

I'll check all of mines. There's NFL, GFF, GFE, ...
I read somewhere that you can get thoses codes with the IL-Devil. I'll let you know when I'll find the article.


#16

I am using a HEPAX module function DISASM

The function prompts for a four digit HEX start and end address, and then displays the m-code listings. For ROM versions just enter xFFE for start and finish rangr\es where x is 0, 1 0r 2 for system ROMs or 3-F for the rest. The Checksum is the next byte xFFF. The checksums for 41CX (NFL ROMs) have matched your value.


#17

Right, Chris !


#18

Hi,

I'm using my own ML cmd REVX? for this.
ROM page in X --> REVX? --> Revision string appended to ALPHA.

This works for pages 0 - 15,
where the first three (built-in) pages give the ROM rev of the OS,
e.g. N,F, and L, higher pages return a 4 character string,
like TM1C, EF1D, etc, and some return simply @@@@.

Raymond


Possibly Related Threads…
Thread Author Replies Views Last Post
  HP Prime Manual Revisions? Craig Thomas 0 1,204 12-09-2013, 11:08 PM
Last Post: Craig Thomas
  Trading TI Nspire CX CAS for HP Prime Justin Sloan (Honolulu) 2 1,290 05-09-2013, 04:22 AM
Last Post: Chris Smith
  HP85 Programmable ROM cardtridge 82929A-service ROM not working- inaki 2 1,836 04-25-2013, 08:08 AM
Last Post: inaki
  shelf life time of a ROM, EEPROM, EPROM vs Mask Rom Guido (Canada) 6 2,911 01-11-2013, 04:09 PM
Last Post: Thomas Falk
  Big ROM - 41 System DEMO ROM Ángel Martin 5 2,514 10-16-2012, 05:28 AM
Last Post: Ángel Martin
  Idea for a 41C rom of "big" programs Gene Wright 7 2,364 10-05-2012, 04:29 AM
Last Post: Mike (Stgt)
  HP 41 CX Celso Cipolato 2 1,269 09-30-2012, 06:38 PM
Last Post: Thomas Klemm
  HP-41C partially repaired, help with "ROM", alpha glitches MattMalone 2 1,181 09-26-2012, 02:26 AM
Last Post: Diego Diaz
  Killed my 41-CX Halfnut aj04062 7 2,588 07-10-2012, 07:47 PM
Last Post: Luiz C. Vieira (Brazil)
  Test HP-41C PPC ROM and STANDARD modules Robert (Simi Valley) 2 1,426 06-14-2012, 08:05 AM
Last Post: Frido Bohn

Forum Jump: