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- TAPR.1
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- Brimming with success, I next tackled the State Machine Mod
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- Kits for TNCs using other than XR 2211 Demod circuitry. No problems
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- were encountered with assembly - everything dropped right into place.
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- After the first unit was completed, I began to install it in the KPC-2.
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- The installation instructions provide information about installing
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- the unit in TNCs containing the more common generic single-chip
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- modems. Required inputs consist of +5 Volts, Ground, Recieve NRZI data,
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- DCD output from the modem chip, and a clock signal source (19.2 khz or
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- 38.4 khz for 1200 baud). I discovered that the KPC-2 did not have a
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- clock source available, so I went to plan 2 - my KAM.
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- The instructions covered installation in a KAM, so I thought I
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- had it made. All the connections were made and checked. All looked
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- fine. Then, I put the audio to it. It worked - backwards... The
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- KAM needed positive DCD out and the instructions used the negative
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- DCD out. I lifted the green wire and put down the yellow wire and...
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- EURIKA !!!
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- CONTINUED IN FILE TAPR.2