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[aprssig] APRStt software?

Scott Miller scott at opentrac.org
Wed May 20 16:13:58 UTC 2009


I don't think anyone's arguing that this would be a resource problem on 
a PC.  It's just that some of Bob's clever schemes turn out to be not so 
easy to implement on small embedded systems.  The SR1 simplex repeater 
hardware I was considering using has 32k of code space and 2k of RAM. 
The advantage of that platform is that it draws about 350 uA at idle, 
80% of that being the RX audio op amp.

Scott
N1VG

Rick Ruhl wrote:
> Ive been writing link lists since I was in high school.  It's easy to do a
> linked list for even 200 stations in a system that only has 256 meg of ram..
> and that's what you need to run XP at the lowest.  Goodness. This may take
> up 2 or 3 meg of memory when Im done with it.
> 
> Most of you guys don't know me, but in the 80's I was part of the team that
> wrote the PC-MOS O/S (multiuser DOS). I always write small code.. I used to
> have to put things in 8 and 16K.. been there done that, like you guys have!
> 
> Rick - W4PC
> 
> 
> -----Original Message-----
> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On Behalf
> Of Lynn W. Deffenbaugh (Mr)
> Sent: Wednesday, May 20, 2009 10:50 AM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] APRStt software?
> 
> Bob Bruninga wrote:
>>> If I remember the APRStt spec correctly, 
>>> it actually requires a DB of callsign 
>>> shortcuts that might be quite a challenge...
>>>     
>> That was abandoned in this new rendition of APRStt.  In this version,
> users always send their full callsign first (with overlay character).  After
> that, they can use only their 3 digit suffix (plus overlay character)
>>   
> Anytime someone can use a full callsign and follow it up with a 3 digit 
> suffix, the APRStt server needs to be remembering the original to match 
> against for the shortcuts.  That's the part that I was indicating a DB 
> (or lookup table or some-such) would be necessary and possibly a 
> challenge for resource-constrained platforms, especially if the 
> shortcuts are valid for 30 minutes or so.
> 
> Lynn (D) - KJ4ERJ - Not dashing the spec, but "real-worlding" some 
> expectations
> 
> 
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