I have looked into this at length without success. It appears that the
parallel port was orphaned in the USB definition and an emulation can
only support printers. Scanners, software key dongles and other
parallel port devices are not and apparently cannot be supported. An
adapter may say that it supports IEEE1284 but they lie.
David
On 1/11/13 1:40 PM, Jim Stephens wrote:
On 1/11/2013 8:46 AM, Chris Albertson wrote:
On Fri, Jan 11, 2013 at 5:09 AM, J. L. Trantham <[email protected]> wrote:
My goal is to connect a parallel port chip programmer via USB but the
software only looks for LPT ports. It works with PCMCIA to parallel
port
adapters but I haven't solved the puzzle yet with a USB connected
device.
I think the best solution is to finally retire that old parallel port
chip
programmer and replace it with something more modern. You might have
paid
a lot for it but today $35 will get you something with a USB cnetion and
then you don't need the printer port.
Chris Albertson
Redondo Beach, California
Chris,
there are programmers out right now that include the parallel port
bitbanging feature. Old isn't part of the equation.
They are identified with the "willem" in the title in some cases. The
one I have derives the power for the logic to run the board and
oversee the programmer from a USB connection. The data to and from
the device is sent via the parallel port to a PC with the software.
Power for programming comes from a wall wart.
The parallel port must be a physical LPT port as mentioned here, on
the PC because of timing issues. I don't think the programming timing
is done by the board, but by the PC's code banging the port.
Many discussions here all have touched on how good you can rely on
timing when USB is involved, so I doubt if the USB extenders will work
very well. People who have tried may comment here, but I would not go
down that path.
A higher cost fully standalone USB attached device is the other
alternative, but would probably still require its own power as well to
get the programming voltages and currents required. What comes down
the USB port probably would not be enough. That is a bit off topic,
but worth mentioning. I am commenting on full capability prom
programmers which will program a wide variety of devices. If you had
to make a USB dongle to program a specific device you might get away
with it. However to handle large devices which require high speed to
get them programmed in a reasonable time period would probably need
more power.
Jim
http://www.ebay.com/itm/261149380462
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