TAPR.1

        Brimming with success, I next tackled the State Machine Mod

  Kits for TNCs using other than XR 2211 Demod circuitry. No problems 

  were encountered with assembly - everything dropped right into place.

  After the first unit was completed, I began to install it in the KPC-2.

        The installation instructions provide information about installing

  the unit in TNCs containing the more common generic single-chip 

  modems. Required inputs consist of +5 Volts, Ground, Recieve NRZI data,

  DCD output from the modem chip, and a clock signal source (19.2 khz or

  38.4 khz for 1200 baud). I discovered that the KPC-2 did not have a

  clock source available, so I went to plan 2 -  my KAM.

        The instructions covered installation in a KAM, so I thought I

  had it made. All the connections were made and checked. All looked

  fine. Then, I put the audio to it. It worked - backwards... The

  KAM needed positive DCD out and the instructions used the negative

  DCD out. I lifted the green wire and put down the yellow wire and...

  EURIKA !!!

CONTINUED IN FILE TAPR.2