24 Jul
2010
24 Jul
'10
6:56 a.m.
On 23 July 2010 19:34, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Just out of curiousity, do the USB-parallel adapters support all the
low-level bit-twiddling that you can do on a real PC printer port? Can
you treat them as 12 digital outputs and 5 inputs?
Nope,. They generally appear as a DOT4 printer device; in other words,
they make a parallel printer appear to the system to be a USB printer,
not the USB port appear to be a parallel port.
But if you need the port, what's wrong with a Centronics parallel port
or a couple of RS232 ports on a PCI card? They are the "real thing",
AFAIK.
--
Liam Proven ? Profile & links: http://www.google.com/profiles/lproven
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On Tue, 20 Jul 2010 10:15:46 -0400
Ethan Dicks <ethan.dicks at gmail.com> wrote:
My views on this aare well-known my now...
I really do not like USB.
Seconded.
It takes hundreds of cycles and more to
move a simple message, it's a host-based, not bi-directional design,
and it's only available on somewhat newish kit.
And: Many USB devices are
quirky. E.g. I can't get a break out of my
USB-RS232 adapters. The USB host bridge in my PeeCee has a bug that