The following warnings occurred:
Warning [2] Undefined array key 169123 - 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 169124 - 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 169125 - 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 169126 - 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 169131 - 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 169135 - 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 169136 - 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 169137 - 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 169168 - 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 169178 - 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 169179 - 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 169124 - 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 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 array key 169168 - 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 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 array key 169179 - 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 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 array key 169136 - 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 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





Woodstock collectors: electrical care/prevention tips and practices?



#12

Hey all,

In the process of finding new homes for the HP27 calculators that I propitiously found at a local-ish university surplus sale, I've come to the conclusion that (unless I'm missing something) there isn't any real SOP about how to take care of these calculators, given that they are, shall I say, electrically sensitive.

For those of you who have Woodstocks, what are your thoughts? Particularly about:

-- Plugging the calculator into the wall. (E.g., is there ever a good reason to do this?)

-- What types of battery solutions are available?

-- 1.5V alkalines vs. 1.2V rechargables. (E.g., are 1.5V cells okay for long-term use?)

-- Is there a "best way" to safely charge the batteries and use the calculator to sustain its longevity? What strategy do you use?

I've found a lot of related information on this site, but scattered across different topics. Hence this post, to hopefully consolidate. I'm thinking that if we can get enough authoritative (or authoritative-ish) info for a FAQ or SOP then it can be re-posted as an article.

If you have any thoughts, I'd be curious to hear it.


#13

My failsafe strategy is to NEVER plug the AC adapter into the calculator and wall, regardless of the condition of the batteries or whether or not the calculator is turned on. I use ONLY flat top 1.2v AA NiCads, and only charger them outside the calculator. I recently found a power pack charger so I no longer need to remove the battery cells from the holder in order to charge them.

Whether or not all of these precautions are necessary, I do not know, however, all my Woodstocks have remained functional over the years and I sleep comfortably.

Operating the calculator while the AC adapter is connected is risky, even if good NiCad batteries are installed, because if the electrical connection between the battery and calculator is not perfect, serious damage can occur.

#14

Hi;

I totally agree with the fact that it is not safe charging the batteries while using Woodstocks, but it is harmless to charge the batteries while the regular Woodstocks (not the Continuous Memory type) are switched to OFF. By analyzing their circuits, the AC adapter is isolated from the calculator circuitry for as long as the ON/OFF switch is turned to OFF.

Anyway, some circumstances must be considered:

IF the batteries' contacts fail and you inadvertently switch it to ON, then you may regret that good time...

In the particular case of the HP27, which uses N-MOS circuits that are not compatible with the circuits from other Woodstocks (cannot donate to nor receive from other Woodstocks than another HP27)

The new batteries are different of the ones used some 30 years ago (ampere capacity, charging time/current, etc.) and these oldtimers would not charge these batteries accordingly.

SOOO... just let the batteries 'eat' energy from an outside source. It´s not worth the risk of burning such fine, rare and expensive HP27´s.

Cheers.

Luiz (Brazil)

P.S. - BTW, if there is any possible, tinny chance of selling one of these, a friend of mine here in Brazil is dying to have an HP27. Not me, a friend, really!


Edited: 28 June 2010, 4:14 p.m.


#15

Hi Luiz,

I think your sentence beginning with "In the particular case of the HP27" was truncated. Or am I just mentally missing something?

Re: HP27 availability. Alas, all five of the ones that I found are now at new homes. That said (and with no regrets), it would have been fun had I heard from you earlier, as the first four ended up on four different continents (without trying). The sale of the fifth to South America would have diversified their distribution even further. Five calculators on five continents: that would have put a smile on my face.

(If you're of the teaching that North and South America are a single continent, ignore me.)

Edited: 28 June 2010, 4:38 p.m.


#16

Quote:
The sale of the fifth to South America would have diversified their distribution even further.

Even further than we could ever have imagined :-) link


#17

Awesome! We Americans are so worldly.

(Come on, who doesn't know that South Africa is located just south of Mumbambu ?)

Edited: 28 June 2010, 7:10 p.m.


#18

I almost died laughing at this (fortunately (?!) my wife tells me that the Onion News Network is a spoof!). That was great. I am already planning my first trip to Mumbambu!


#19

If you liked that one, I recommend looking at some of their others. They're consistently very funny.

On the topic of technology, I highly recommend this one.

#20

Can we have the HHCC in Mumbambu this year...?


On another note, a friend of mine says he was at a party one day. Someone asked "what is the capitol of Africa?" Without missing a beat he answered "Swahili." We American's can be so stupid sometimes.


#21

In this case, I would go. Go Mumbambu!

Luiz (Brazil - in the south of America!)

Edited: 30 June 2010, 9:48 a.m.

#22

Quote:
I think your sentence beginning with "In the particular case of the HP27" was truncated.
Yep, you are correct. I thought about writing:

'This is even worse in the particular case...'

Then I worked it out and intended to write:

'In the particular case of the HP27 this is even worse...'

And I ended up missing the 'this is even worse' part of it. I left home right after that and went back right now.

Thanks! (I hope now it is everything in place...)

About the America: geographically I see them all as one America only (hence a single name), but I must consider three of them as for their different people, cultures and history living in three different 'slices'. I cannot only take the fact that the three 'slices' are joined by common land (no ocean between them) because Europe, Asia and Africa also have a lot of joined lines.

Luiz (Brazil)


Edited: 28 June 2010, 9:57 p.m.


Possibly Related Threads…
Thread Author Replies Views Last Post
  Usefulness of Woodstock Cs without their C Matt Agajanian 5 2,645 12-10-2013, 02:05 PM
Last Post: Geoff Quickfall
  HP 41 Advanced Programming Tips Michael Fehlhammer 0 1,141 11-28-2013, 06:11 PM
Last Post: Michael Fehlhammer
  [HP Prime] Tips for Solving Differential Equations More Efficiently Chris Pem10 8 2,809 11-21-2013, 08:25 PM
Last Post: Chris Pem10
  Woodstock, Classic & Spices for iPhone Matt Agajanian 8 2,756 07-10-2013, 06:10 PM
Last Post: BShoring
  For you serious HP collectors Fred Lusk 13 3,376 02-20-2013, 10:38 PM
Last Post: Fred Lusk
  OT--Palm & Sharp Wizard need tech care Matt Agajanian 9 2,791 08-28-2012, 11:54 PM
Last Post: Matt Agajanian
  Care and Feeding of Topcat NiCads Les Wright 16 4,202 06-01-2012, 06:01 PM
Last Post: LHH
  A Woodstock 67 Matt Agajanian 4 1,992 05-20-2012, 10:57 PM
Last Post: Mike Morrow
  Disassemble Battery Pack 82028B (woodstock) Jacques Karensky 0 1,102 05-19-2012, 03:39 AM
Last Post: Jacques Karensky
  Woodstock/Spice Keyboard Cleaning Revisited Matt Agajanian 0 1,012 05-12-2012, 03:43 PM
Last Post: Matt Agajanian

Forum Jump: