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Conference akocoa::decpc_portables

Title:DECpc _Portables
Moderator:PCBUOA::GLANTZ
Created:Wed May 08 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2423
Total number of notes:11059

2323.0. "VP535 and PCMCIA Power" by SLOAN::HOM () Fri Mar 07 1997 19:24

I noticed that my modem PCMCIA card was warm during normal operation
- even when the modem is NOT used.

Is there a way to turn off the power to the PCMCIA socket?
The BIOS on the VP535 is in many ways more primitive than the
the Ultra I BIOS.

Gim

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2323.1BUSY::SLABGrandchildren of the DamnedFri Mar 07 1997 20:2016
    
    	I'm under the assumption that, for whatever reason, there is al-
    	ways power going to the PCMCIA card.  The manual that came with
    	my non-Digital laptop [or maybe it was the manual that came with
    	the modem] warned that leaving the PCMCIA card plugged in would
    	drain the battery.
    
    	How about unplugging the modem card when it's not being used?  I
    	don't do it as a rule, since I haven't had a reason to operate
    	the machine on battery power so have no immediate need to save
    	the battery's charge, and would rather not risk premature wear
    	of the connectors between modem/socket.  As far as I know, the
    	laptop shouldn't lose all the modem set-up info every time you
    	unplug it, so it's a matter of plugging it back in when you want
    	to use it.
     
2323.2Not in this incarnation of the PCMCIA spec.PCBUOA::FERRANTEVWed Mar 12 1997 15:5113
    The problem is that if you turn the power OFF to the slot, how or when
    would you tell the software or system to turn the power back on so that
    you can use the card ? If you turn the power OFF, the
    operating systems sees that as a card removal and assumes that you do
    not want to use that card anymore this power session. 
    
    If Win95 or some of the applications get smarter about power on and off
    it would make sense to try to control the slots. Cardbus slots do control
    the power and applications and drivers are sensitive to power on and
    off and this should save battery and wear and tear on your cards.. Look
    for CardBus slots on our new systems shipping in a few weeks...
    
    Vin.