Re: TI-H: New topic, since the list has been dead.
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Re: TI-H: New topic, since the list has been dead.
You can _never_ assume this.
In this particular case, the signals are the same, and the voltages are the
same, but the amperages may be very different, _especially_ on a laptop.
-Adam
Wesley Moore wrote:
>
> As far as I know the PS/2 and AT keyboard port are the same since you can
> get simple adaptors that convert AT -> PS/2.
>
> Wesley
>
> ----- Original Message -----
> From: Adam Davis <adavis@baladyne.com>
> To: <ti-hardware@lists.ticalc.org>
> Sent: Saturday, 21 August 1999 12:40
> Subject: Re: TI-H: New topic, since the list has been dead.
>
> >
> > AT keyboard ports were reated to 1/2 amp current @ 5V. I'm unsure about
> ps/2
> > keyboard ports, but I'm sure it's more than the serial port.
> >
> > I have an oem gps receiver board which draws about 1/4 amp when being
> used, and
> > I imagine that's close to what yours is taking.
> >
> > -Adam
> >
> > jeff dezur wrote:
> > >
> > > well, the company that makes the GPS sells one for about $25, but I was
> > > hoping that I could make one for a fraction of the cost. They also have
> an
> > > adaptor that works off the keyboard/mouse port of the laptop also. would
> > > that possibly give off more power than the serial port?
> > >
> > > -jeff
> > >
> > > ----- Original Message -----
> > > From: Nick <zaphod@gis.net>
> > > To: <ti-hardware@lists.ticalc.org>
> > > Sent: Thursday, August 19, 1999 5:53 PM
> > > Subject: Re: TI-H: New topic, since the list has been dead.
> > >
> > > >
> > > > Get a power adapter for AC voltage or build your own with a 723. Not
> near
> > > > enough power to drive anything but LED's coming out of a serial port,
> and
> > > > it's not really regulated well at all. If it's sucking your 4 AAA's
> dry,
> > > > it's taking way too much power to be driven by the miniscule current a
> > > > serial port puts out.
> > > >
> > > > Get a 6v lantern battery & clip the wires to the battery springs.
> Wear it
> > > > on your belt. That ought to get you a couple days of power at least
> ;)
> > > >
> > > > --nick
> > > >
> > > > Nick Foster / Bistromath / zaphod@gis.net
> > > > KeyID 2048/1024 0x663CB446
> > > > 6CAF FFD4 F9BA 64BA ECF9 032E 7402 3886 663C B446
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: jeff dezur <jeffd@wwnet.net>
> > > > To: <ti-hardware@lists.ticalc.org>
> > > > Sent: Thursday, August 19, 1999 5:00 AM
> > > > Subject: TI-H: New topic, since the list has been dead.
> > > >
> > > >
> > > > >
> > > > > I picked up a GPS reciever the other day, one that interfaces into
> the
> > > > > serial port of my laptop, and sends the info across that. well, it
> only
> > > > > lasts a little while on the batteries (4 AAA, which, not to my
> surprise,
> > > > are
> > > > > expensive... compared to others)... I popped it open, and of course,
> > > > there's
> > > > > not much in it, but, what I was wanting to know, is there a way, for
> me
> > > to
> > > > > set a signal high on the serial port, so I could get the required
> +5-6V
> > > > that
> > > > > it needs for power? I was reading around, and the serial port,
> according
> > > > to
> > > > > a few websites, gives off a +3-25V... which either will cause the
> GPS to
> > > > not
> > > > > do anything(lack of power) or fry in a cloud of smoke (25V), and end
> up
> > > in
> > > > > me blubbering over the $150 I spent for it... Since there's not an
> > > extreme
> > > > > amount of room, definitly not enough for a +5 voltage regulator,
> unless
> > > > it's
> > > > > surface mount, any ideas on how I could get it to work?
> > > > >
> > > > > -jeff
> > > > > jeffd@wwnet.net
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> >
References: