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The Friday 2007-03-16 at 15:11 -0700, David Brodbeck wrote:
> > Then you will have to get port pci cards, but if you are using
> > portables, you are out of luck. pcmcia then?
>
> I would be shocked if no one makes a USB device with some input and
> output terminals for this kind of basic "bit-banging" I/O.
But not all signals are considered.
> PC Cards
> with RS-232 ports or parallel ports also still exist, although they
> probably aren't cheap.
Dunno about price.
> Basically, where you used to get one or two ports for free on each
> machine that you could use for this kind of basic I/O, in the future
> you're going to have to pay for them.
If I have to pay for a port that I'm going to use for some kind of DAQ, I
would get a real DAQ card instead: even a cheap one would be much better.
A D/O, D/I card is far easier to use than a printer parallel port (a
single cpu instruction, that's all).
And, for cheap I/O, there are usb things doing the job already (not really
cheap, probably). The problem is when you need speed and/or sync, as Roger
says.
- --
Cheers,
Carlos E. R.
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