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  • printer port interface

    parallel printer port.jpg

    my qbasic lap counter program applies power to pins 6,7,8,and 9.
    then pins 10, 11,12 and 13 are monitored for trip signals via magnetic reed switches.
    I used pin 4 to apply power to a relay driver to apply track power or remove it.
    guess computers don't use the printer port anymore

  • #2
    Yep. Parallel and serial ports are long gone from today's computers. It's USB everything peripheral, and HDMI for video.
    You might be able to dig up a parallel port expansion card for a desktop machine with expansion slots.
    There are also USB to parallel adapters that may or may not work for your hardware.

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    • #3
      i have an old printer that works on lpt1.
      i bought a USB adapter cable to print from my "new" computer....
      used a "generic" driver to print to it
      wish a knew a bit more about if it (the generic driver) might also work if i ran my lapcounter program thru it?

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      • #4
        worth a try

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        • #5
          For computers that only have USB ports both serial and printer port adapters are available. In both cases the adapter includes some electronics and a software driver needs to be installed for them to work. The serial to USB port adapters seem to work OK, I use one myself, but the printer to USB port adapters have proven to be problematic. With those I suspect that the driver is the hitch.
          In the past if you needed to connect a device with a serial or printer (parallel) output and did not want to fuss with an adapter you could always buy a used computer with the right ports, now that might be difficult to do.

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