LPT pinouts

[Ken Wolff]

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               Line Printer (LPT) Pin Assignments
                        CT V9.26 

Each LPT has up to 12 ouput pins: 1-9, 14, 16, 17


-----------------------  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                this used to be LPT2 pin2


-----------------------  LPT2

Antenna switch data:    2, 7, 8, 9        for second radio
Antenna switch strobe:  14

Radio1/Radio2 control:  16                for second radio - inverse of LPT1


****************************************************************************

            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




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ken@packetcluster.com (Ken Wolff)

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