If you see something, run across something let me know

this is the program running on the PC
For j = 1 To 8000
    DlPortWritePortUchar &H378, 1
    DlPortWritePortUchar &H378, 0
Next j

this writes a 1 to the 8 bit port at this memory location, and then
a zero.  and this works via a call to a subroutine in a dll
(I think that's what's going on...)  I installed the dll, put a declaration
in
a module, and use the above call

Now, I don't know if this bypasses the API or anything, or if it takes
priority of the machine in any way, it seems to, but I need to continue
looking
some more.

It does give the output as described before.

a flat line at around zero with vertical lines or spike of about 3.5 v


thanks

ponder amongst yourselves...I'm hooking my scope up to the dog now,
the cat has disappeared....


----- Original Message -----
From: "Kyrre Aalerud" <kreature@C2I.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, January 22, 2003 1:22 PM
Subject: Re: oscilloscope pulse display


> I'll try to find the project again and post a link.
> I don't know all the details, but it was something about programming a
> device to turn it off, and using processor to turn it on, thus allowing
for
> some higher speed or something.
> It apparently only worked with a specific model paralell port and I asume
> this was a speed issue.
>
>     KreAture
>
> ----- Original Message -----
> From: "M. Adam Davis" <adampic@UBASICS.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Wednesday, January 22, 2003 7:31 PM
> Subject: Re: oscilloscope pulse display
>
>
> > Kyrre Aalerud wrote:
> >
> > >Not true Bob.
> > >
> > >I have seen higher frequencies generated by paralell port.
> > >Noone higher than 200 MHz though.  By bit-banging 8 bits paralell
instead
> of
> > >doing a normal write you can get 4 mbyte transfer over a paralell link
if
> > >you're lucky...
> > >
> > >    KreAture
> > >
> > >
> > Really?  I'd be interested in seeing how this is accomplished.  I
> > suppose if you take a newer intel machine with a front side bus of
> > 533MHz you could design the parallel port into the northbridge and
> > /possibly/ change the state of the port 400MHz if you had all your code
> > in the cache, ran off registers in the CPU, and didn't require any other
> > system resources or listen to any interrupts.
> >
> > The front side bus is the speed at which the CPU communicates with
> > everything on the systemboard.  Unless there's a trick that I don't
> > understand, you cannot transfer more than 32 bits of data into or out of
> > the processor more than X times a second, where X is the front side bus
> > speed.
> >
> > A 4M Byte per second transfer from the parallel port only requires 4MHz
> > speed, which is very achievable via the normal route
> > (CPU-->Northbridge-->Southbridge-->PCI Bus-->Parallel port (with
> > possibly an ISA bridge in there as well, though that could be a limiting
> > factor))
> >
> > -Adam
> >
> > --
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