Re: CF card and the Sharp PC3000/HP95LX experiences (fwd)

["Jan Jonkman" <jan@xxxxxxxxxxxxx>]

On 6 Feb 2002, at 12:51, Sven Utcke wrote:

> Hi all,
> 
> > From: FELIQUE CHRISTIAN <Christian.Felique@xxxxxxxxxx>
> 
> reported the following with regard to his HP95LX --- maybe this is of
> some interest to you, or maybe you could help out with some of his
> questions:
> 
> > I read about your CF experiment for the Sharp PC3000, and was keen to try it on
> > my HP95LX. This is what my experience is with a Sandisk CF 32Mb card:
> > 
> > (1) In the HP95LX the CF still draws current even when it is turned off.
> > (2) When reading/writing to the card annoying black lines appear on the screen.
> > 
> > (1) I solved this by cutting the Vcc line inside the PCMCIA to CF
> >     adapter, on the PCMCIA side of the adapter. Note that there are
> >     three voltage lines on a PCMCIA connector: Vpp1,Vpp2,Vcc. Vpp1
> >     and Vpp2 are (at least I think so) connected to the Vcc of the
> >     CF slot. The CF slot only has Vcc, and no Vpp1 and Vpp2. I think
> >     that Vcc on the PCMCIA connector is always powered, and Vpp1 and
> >     Vpp1 is only powered when reading, writing to the card.  Anyway,
> >     the CF card still works, and the card doesn't draw current
> >     anymore when my 95LX is turned off.
> > 
> > If you experience the same problem on your Sharp, then this might be a solution
> > for you too. 
> > 
> > (2) The reason for this problem is the fact that the CF drains a lot of current when
> > reading/writing. The LCD screen is connected to the same 5V power supply as the PCMCIA slot.
> > That explains the black lines.
> > 
> > My questions:
> > 
> > Do you know how much current a CF drains when reading/writing ?  Do
> > you experience the same problems on your Sharp PC3100 ?  Are there
> > members of your mailing list that experienced this problems, and/or
> > found any solution for it. Maybe other soldering/cutting lines/CF
> > adapter modifications would solve this problem ? Any advise is
> > welcome.
> > 
Power.exe from DIP has an option /c- or /a that according to the 
description only powers the CF card when accessed. It works 
similar with the other external ports.

Jan

> > Thank You
> > 
> > Best Regards,
> > 
> > Christian Felique
> > 
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