ARTICLE SYNOPSIS ...The electronic bulletin board comes of financial age by Marshall Rens and Federico L. Brown If you've never explored one, computer bulletin boards must seem b-o-r-i-n-g -- a bunch of hacker nerds earnestly arguing via their personal computers the merits of Intel's 80386 chip over Motorola's 68020 or engaged in other trivial pursuits. It's a pity, because for the computer owner the bulletin board system (BBS) is heaven on earth--a quick source of thousands of free investment software programs. All yours for the asking. All free, or the next thing to it. If these programs were just games, you co...