HP-28S questions

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Well, now I have clock working on my new HP-28S with the great help of the forum. Thanks!

HP-28S quickly placed itself as my favorite calculator, and I like it very much! Much easier to use than other RPL's I have (48GX & 50G)! Having not used RPL for a decade (except some unsatisfactory experiments with HP-50G), I'll try to return to it.

So I have a lot of Qs, including, but not limited to:

1. Where can I get archives of comp.sys.hp28?
2. Please, give me some clues, which ftp sites with HP-28 programs are still alive? Or mirrored? (I've already got everything from http://ftp.funet.fi).
3. How do you enter different characters, eg ":" or ";" not using CHR?
4. Is there any (semi)OFFICIAL SYSEVAL list fo HP-28S with docs?
5. Is there any HP-28S/48GX or, at least, 48SX function comparison document?
6. I have user manual, reference guide and all hpmuseum DVDs, but found no info on HP-28 sysrpl programming. Where to search?

tia,
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