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'tnc packet radio'
1998\03\21@113750 by Mark Lezama

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Thanks in advance!

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1998\03\21@121758 by James Merritt

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Hi Mark,

Here is a url for Poor Man's Packet that was popular about five or six years
ago, a friend of mine built one and it worked just fine.

http://ascension.cit.cornell.edu/pmp.html

Hope this helps.


--
James E. Merritt N0SRB                  Iowa State University
spam_OUTjemTakeThisOuTspamiastate.edu                         Center for Nondestructive Evaluation
Electrical Engineering student          x-ray tech/modeller/programmer

1998\03\21@123632 by Tom Mariner

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Hola Mark,

Since tnc's talk X.25, I would start at
http://www.arrl.org/catalog/index.html, the catalog page of the Amateur
Radio Relay League. I would order the book Practical Packet Radio, by Stan
Horzepa.
We have done some applications in X.25 in parts from 16C54's to 16C74's and
they work great. The HDLC-style protocol is medium complex, but is designed
for networks that have RF as the physical layer. The code, however, belongs
to our clients and / or us.

On Saturday, March 21, 1998 11:32 AM, Mark Lezama
[SMTP:.....mfidelKILLspamspam@spam@TELCEL.NET.VE] wrote:
> Anyone know where can I find a TNC packet radio designe?
>
> Thanks in advance!
>  << File: vcard.vcf >>

1998\03\21@141302 by Mark Lezama

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1998\03\22@091029 by Tom Mariner

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Oops, Obviously the "X.25" should read "AX.25"

And follow this link to the definition of V 2.2 of the spec:
http://www.tapr.org/tapr/html/ax25.html.

Tom

On Saturday, March 21, 1998 12:15 PM, Tom Mariner
[SMTP:Tom_MarinerspamKILLspamEMAIL.MSN.COM] wrote:
{Quote hidden}

1998\03\24@004627 by paulb

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James Merritt wrote:

> Here is a url for Poor Man's Packet that was popular about five or six
> years ago, a friend of mine built one and it worked just fine.

> http://ascension.cit.cornell.edu/pmp.html

 Thanks for the link.  I find PMP enigmatic.  As the source is supplied
(or I gather it is,) it is an excellent starting point for development
of packet radio firmware.  As this was asked for, it is a good and
appropriate answer.

 OTOH, as a means of operating packet radio, it is all but useless!
True, it works, but it does not do much, and by nature of its design,
cannot.  It came out just before BayCom, perhaps at the same time.
BayCom is interrupt driven, and though the source is proprietary, the
concept was elucidated and extended by others including Pawel Jalocha
(some of whose source is also available, and should be searched for)
into fully functional systems including NOS and BPQ drivers for BBSs.

 TFPCX is an alternative approach using a 3X baudrate interrupt clock
only.  It can't operate under a PC RTOS (Windoze?) but is reasonably
suitable for an embedded system.  No idea about sources though, except
that PMP can readily be adapted in this direction.

 Cheers,
       Paul B.

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