LPT pin assignments

[Fred Cady]

>
>
>I have attached an LPT port document. Please comment. I tested all these
>pins on my computer, so I need you to tell me under what conditions they
>don't show up on your computer. Thanks
>               Line Printer (LPT) Pin Assignments
>
>****************************************************************************
>
>            Proposed pin assignments for V9.27
>
>
>-----------------------  LPT1
>
>Antenna switch data:    2, 7, 8, 9        Top Ten Devices
>Antenna switch strobe:  14
>
>CW Keying:              1
>CW Pullup:              17
>
>DVK F1-F4:              3, 4, 5, 6
>Radio1/Radio2 control:  16                
>
>
>-----------------------  LPT2
>
>Antenna switch data:    2, 7, 8, 9        for second radio
>Antenna switch strobe:  14
>
>Split headset bit:      16                set and cleared with ALT-? to
>                                          control headset audio per AB6FO 
>
>CW PTT:                 1                 to avoid relay chatter
>
>Escape bit for DVK:     17                pulsed low to halt DVK
>
>
>

Thanks, Ken for the information.  I would like to suggest that radio-2
keying be accomplished by putting CW Keying and CW Pullup for radio-2 on
LPT2 pins 1 and 17.  You would have to allocate another bit for the DVK
escape bit.  This shouldn't be a problem with the guys that do use a relay
to switch keying from radio-1 to radio-2 because the two open collectors can
be just wire-ored together.  I don't know what impact that has on the
software, thoough.  Does it mean that two radios can be cqing at once?

Fred KE7X
Fred Cady (ieefc@msu.oscs.montana.edu)


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