On Nov 8, 6:37pm, ken wolff wrote:
> Subject: LPT ports, another proposal
> The program would have two "modes," old and new. Old mode continues to
> work with existing CW keying circuits and would be the default. New
> mode requires rework of the LPT connector circuit. In both cases LPT1
> and LPT2 are nearly identical. Using this scheme you may enable CW
> keying and DVK keying from either LPT1 or LPT2.
>
I like it!!
> New mode Pinouts:
>
> Antenna switch data: 2, 7, 8, 9 (LPT2 has band data for radio 2)
> DVK F1-F4: 3, 4, 5, 6
> DVK escape: 1 asserted for 100ms when escape pressed
> PTT: 16 asserted with PTT
> CW key: 17 asserted on key down
> Radio1/Radio2: 14 (on LPT2 this is audio select per AB6FO)
>
Might I suggest ...
New mode Pinout
DVK escape 16
PTT: 17
CW key 1
Advantage:
Keeps more pins the same between the "modes".
It allows going to the new mode and not having to reconfigure
DVK's pins or interface circuitry much. Outboard boxes will need
a some changes on the transistor used for keying. The contest
card will need a trace cut and a pullup resistor. (I think, the
circuit details are from memory).
Disadvantage:
None that I can think of. Others?
Overall I like the proposal. Thanks for the opportunity to comment!
73, Jim, WA6SDM
jholly@cup.hp.com
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