I've been collecting freeware and shareware 1980s stuff on disk images for use in Mini vMac (mentioned earlier) that you might want to try out:

http://www.emaculation.com/doku.php/system_6_hell

Some old classics are there. "Cairo Shootout" is one of the great 1980s shareware titles. You could play the original Macintosh versions of "Daleks" and "Core Wars," too.