It will be very fast indeed on a 1.1 GHz computer.
Depending on what other tasks the computer is doing at the same time, and
depending on how you are switching the pin, it may wery well be at 500 MHz.
It will also depend on the hardware of the PC.  If it can handle what you
are forcing it to do.

    KreAture


----- Original Message -----
From: "rad0" <rad0@ATTBI.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, January 22, 2003 5:27 PM
Subject: [ee]: oscilloscope pulse display


> OK, you guys talked me into getting an oscilloscope
> and now ii's displaying something that is wierd
>
> I have a program that toggles a pin on the parallel port of a PC
> just on then off, as fast as the thing will go
>
> and this produces a display of a horizontal thick line with
> a completely vertical line, spike, every so often, I've forgotten
> to record the time between these vertical spikes or lines
>
> Is it possible that this is just going too fast for the oscilloscope? a
> 100Mhz
> the PC is a 1.1 Ghz
>
> I was expecting a square wave of sorts, and this thing I'm not sure what
it
> is...
>
>
> the thing works fine on pic pulses, giving nice square waves for the range
> of
> pulses given by a 20mhz pic
>
>
>
> thanks for any insights
>
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