48GX, TDS RAM Card, Low Batt Indicator



#6

When the TDS RAM card is put in the 48GX, the calculator indicates a low batter on the card (low batt P2). This is a card without a battery. The extra memory shows up on the calc, as expected.

Tried another to-battery TDS card, and there was no low batt indication. Can someone explain this to me? Many thanks.


#7

Does it still show the low battery indicator with the card removed?

Do you mean a ROM card by any chance? If so, then maybe try a warmstart by holding down the ON key, pressing and releasing the C key, and finally releasing the ON key. If that doesn't help, you could try archiving user memory, then doing a user memory clear by holding down the ON key, pressing the A and F keys, then releasing first the F key, then the A key, and finally the ON key, and then pressing the NO menu key in response to the "Try To Recovery Memory?" message.

All RAM cards do have a battery, but I seem to recall that some cards use a non-replaceable battery, intended to last for the "life of the product". In other words, if you can't replace the battery in your RAM card, then it's lifetime is over.

Regards,
James

#8

Quote:
In other words, if you can't replace the battery in your RAM card, then it's lifetime is over.

Not an accurate statement...

The later TDS and SMI cards that have internal batteries are charged by the GX when it is powered on.

Let your GX sit for a month or two without turning it on and you'll have the exact situation you just described.

The details from the TDS website:
HP48GX Memory card info

Edited: 15 July 2007, 10:52 a.m.


#9

Thank you. That's the information I needed.

#10

Thanks for the correction, and the link to the relevant TDS page.

It seems that the card's lifetime isn't really over until its rechargeable battery fails to take a charge.

Quote:
The later TDS and SMI cards that have internal batteries are charged by the GX when it is powered on.

Let your GX sit for a month or two without turning it on and you'll have the exact situation you just described.


And I expect that the same would happen if the card were removed for a month or two.

Does anyone know which type of rechargeable battery is used in these cards?

TDS's method of setting a repeating alarm to keep the calculator turned on is good, but I'd add that it would be better to use a "control alarm" (such as the program \<< DROP \>> for the "message" instead of a character string) instead of an "appointment alarm", so that it doesn't sound the beeper. Also, since the automatic turn-off on the 48 series seems to be 10 minutes, I'd set up the alarm to repeat every 599 seconds instead of every 299 seconds. One could also add a control alarm to delete the repeating alarm after 24 hours. I'd prefer to try running this recharging procedure starting with fully-charged NiMH AAA cells.

Regards,
James

Edited: 16 July 2007, 3:05 a.m.


#11

PS:

I wrote:

Quote:
... it would be better to use a "control alarm" (such as the program \<< DROP \>> for the "message" instead of a character string) instead of an "appointment alarm", so that it doesn't sound the beeper.

Better yet, go ahead and use an appointment alarm (any character string for the message), but set flag -57 (Alarm beep off). Flag -43 should be clear (Reschedule alarm), the default state, so that the unacknowledged repeat appointment alarms will actually be repeated.

Regards,
James


Possibly Related Threads...
Thread Author Replies Views Last Post
  42S with nonvolatile RAM Lyuka 5 1,794 12-13-2013, 08:52 AM
Last Post: Lyuka
  HPprime CRASH and mysterious clepsydra indicator fabrice48 3 1,168 10-30-2013, 03:17 PM
Last Post: cyrille de Brébisson
  Very low Price of HP Prime? Harold A Climer 14 2,575 10-10-2013, 01:51 PM
Last Post: Frank Boehm (Germany)
  Best way to test HP-71B RAM modules (the 32K/96K ones etc.)? Philippe Lasnier 4 1,574 09-25-2013, 09:54 AM
Last Post: Philippe Lasnier
  Low battery slow mode Marcel Samek 4 979 09-18-2013, 02:02 PM
Last Post: Harald
  Low power warning for HP-15C LE and batteries Nick_S 1 877 09-16-2013, 09:34 AM
Last Post: Hans Brueggemann
  HP 2225D+ RAM failure/replacement Luca 4 1,225 09-10-2013, 01:46 PM
Last Post: Luca
  WP-34S: Little issue with program step indicator Miguel Toro 6 1,443 09-06-2013, 12:45 PM
Last Post: Miguel Toro
  Questions about building a RAM card for hp 48 Waon Shinyoe (China) 0 673 07-09-2013, 09:53 PM
Last Post: Waon Shinyoe (China)
  Error Message/Procedure HP-48SX with TDS Survey SX card bporter101 6 1,199 12-10-2012, 10:18 AM
Last Post: bporter101

Forum Jump: