> I am trying to send a pulse on on of the data pins of the parallel port in a
> real-time task. This takes 2 write operations (1.4 uS each). I am looking for
It's the ISA bus speed that's causing the problem. The best solution
would be to get a PCI protoboard ( www.digikey.com ) and send the pulse
that way. Another way is to use the already formed ~iowr or ~iord line
from the ISA bus properly gated by a designated address decoder. This
will generate a negative going pulse abt 200ns wide I think. You will
only need to send one outb instruction too, since it causes a complete
pulse. You can "tweek" the bus control chips to "high speed"
"on-the-fly" just before you issue the outb, and back to normal afterward.
I've used this method to speed the normally 8mhz bus clock up to 16mhz or
higher during selected ISA I/O operations.
The ISA I/O speed is terrible.
-C. W. Wright
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