> > How did I do?
> Give that man a prize! It can load in 64 bits in a minimum of 420ns,
> and puts it into the Dacs and control system. The loading circuitry is
> surprsingly simple, and fast; but the board is very stupid-just
> follows input intructions.
Is this an ISA video card? If so, the bus runs @ 8Mhz, and that's only
roughly 16 megabytes a second maximum (16 bits at a time). Best case
that'd take 4 microseconds to load in 64 bits. Or is this PCI?
With the overhead of PCI grant and release, you're looking at a minimum of
4 cycles to transfer a single 32 bit quantity. At 33Mhz, that's about
120ns, and that's assuming that the PCI bus is totally free.
How are you able to guarantee any sort of timing (also considering
interrupt/OS overhead) to keep the beams a constant intensity?
> port,MANY old cards that do don't support output (It was expensive
> finding THAT out) The port is lonely-it needs to be used! I think the
> connector that runs the new flat-screen monitors may work too,
You mean the DVI connectors? Unfortunately, they're analog, too with some
additional signalling.
> or the
> Parallel port, with input mods. This version I'm doing now does NOT
> have any buffer on it, so timing is critical...maybe will add later if
> a real problem. (V and H blank) I want to do vector art! (test pix
> soon!)
Kewl!
> BTW, i can't believe I asked what the baud rate of a parallel port
> was-it was late...
Reminds me of some of the few times I've done some sleep-programming. It's
like sleep walking, but you wind up fighting really stupid things and
generating crap code, only to solve it in about 2 minutes the next
morning. ;-)
-->Neil
-------------------------------------------------------------------------------
Neil Bradley What are burger lovers saying
Synthcom Systems, Inc. about the new BK Back Porch Griller?
ICQ #29402898 "It tastes like it came off the back porch." - Me
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Received on Wed Jul 3 22:42:13 2002
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