The one drawback to TNC¡¯s being daisy chained together on a single serial port, is that in one of the TNC¡¯s stops working in the chain, ALL of the TNC¡¯s on that serial port stop working.
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Worth noting is that the speed of the serial port needs to be at least the sum of all the TNC¡¯s serial ports in the daisy chain. This would suggest that your serial port speed should be set to the same as your on air speed because if you had 4 TNC¡¯s in a chain where the serial speed was set to 9600 baud, the computer serial port would have to have a speed of 9600 x 4.
I uploaded the linux source code for the driver, and (the translated) web pages from the old German flexnet site in case anyone wants to take it on.?
I found it in archive.org's wayback machine. I also included the 6pack eprom in the zip file.
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/g/bpq32/files/6pack_info.zip
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I think the coolest thing about 6pack is the way you can daisy chain TNC's via just their RS232's TX and RX's together in series like a token ring network. Doing this lets lets you run multiple TNC's on one rs232 PC port?