Curt, WE7U wrote:
On Wed, 25 Jun 2008, Chris Moulding wrote:
Many thanks, Bob for your detailed clear explanation of the
situation regarding modems. It looks like my best option is to
find a suitable KISS modem circuit to convert the data on transmit
and receive. It would also make it compatible with all APRS
programs.
FWIW my first entry into packet was an XR2211 hooked to a radio's
speaker jack and a uP interrupt pin. I coded the receive routines
and interrupt handler in assembly, ran them inside a Forth
interpreter.
Damn, that's hard core!!!!
Hmmm, wonder if there's a VMware image for Forth?
I also computed the CRC16. I wouldn't recommend doing
it that way, but it did work. That was on a 0.79MHz 6803 as I
recall. I didn't do transmit on that setup, only receive. That was
in early '85 I think.
All of that is taken care of if you start with a KISS TNC. The
Tracker2, the OT1+, the TT4, and the TNC-X can all do it for very
small $$. Some of them may be able to do 300 baud as well.
--
Kurt A. Freiberger Austin, TX [EMAIL PROTECTED]
Amateur Radio Callsign WB5BBW AIM Handle: WB5BBW
"Reputation is what other people know about you.
Honor is what you know about yourself."
- Lois McMaster Bujold - "A Civil Campaign"
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