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[aprssig] TNC2 KISS eprom

Ron Stordahl ron.stordahl at digikey.com
Mon Nov 7 21:51:45 UTC 2005


There also is BPQKISS which is a multidrop system (just a single com port
talking to multiple TNC's).  That is also in the

http://dxspots.com/bpq408a.zip package.


As to licenses, with respect to JKISS and BPQKIS why not ask John GM8BPQ?
You can reach him on the BPQ32 Yahoo Group which he monitors.

Ron, N5IN


----- Original Message ----- 
From: "Curt, WE7U" <archer at eskimo.com>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Monday, November 07, 2005 2:37 PM
Subject: Re: [aprssig] TNC2 KISS eprom


> On Mon, 7 Nov 2005, Scott Miller wrote:
>
> > Who owns the tnc2kiss firmware?  What's the distribution license?  Would
> > anyone mind if I offer tnc2kiss chips for a few bucks?
>
> Make sure you know what flavor people want.  Here are some notes I
> have on it, buried in the Xastir and SmartPalm sources.  I just
> added JKISS to the list:
>
>
> // Note about KISS & CRC's:  The TNC checks the CRC.  If bad, it
> // drops the packet.  If good, it sends it to the computer WITHOUT
> // the CRC bytes.  There's no way at the computer end to check
> // whether the packet was corrupted over the serial channel between
> // the TNC and the computer.  Upon sending a KISS packet to the TNC,
> // the TNC itself adds the CRC bytes back on before sending it over
> // the air.  In Xastir we can just assume that we're getting
> // error-free packets from the TNC, ignoring possible corruption
> // over the serial line.
> //
> // Some versions of KISS can encode the radio channel (for
> // multi-port TNC's) in the command byte.  How do we know we're
> // running those versions of KISS though?  Here are the KISS
> // variants that I've been able to discover to date:
> //
> // KISS               No CRC, one radio port
> //
> // SMACK              16-bit CRC, multiport TNC's
> //
> // KISS-CRC
> //
> // 6-PACK
> //
> // Multi-Drop KISS    8-bit XOR Checksum, multiport TNC's -,
> // G8BPQ KISS         8-bit XOR Checksum, multiport TNC's -|-- All the
same!
> // XKISS (Kantronics) 8-bit XOR Checksum, multiport TNC's -'
> // JKISS (G8BPQ KISS)
> //
> // MKISS              Linux driver which supports KISS/BPQ and
> //                    hardware handshaking?  Also Paccomm command to
> //                    immediately enter KISS mode.
> //
> // FlexKISS           -,
> // FlexCRC            -|-- These are all the same!
> // RMNC-KISS          -|
> // CRC-RMNC           -'
> //
> //
> // It appears that none of the above protocols implement any form of
> // hardware flow control.
>
>
> If anyone has corrections to these notes, I'm all ears!
>
> --
> Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
> "Lotto:    A tax on people who are bad at math." -- unknown
> "Windows:  Microsoft's tax on computer illiterates." -- WE7U
> "The world DOES revolve around me:  I picked the coordinate system!"
>
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>





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