What is a modern mainframe computer? IANAP [more inside]
posted by mhh5 on Jul 7, 2009 - 15 answers

How would one go about pricing and buying an old mainframe computer, an IBM 360/30 to be specific?
posted by zorro astor on Jan 30, 2008 - 7 answers

I want to learn mainframe-era languages and technologies (e.g., AS/400s, RPG, COBOL). Where can I go to get started? [more inside]
posted by Jeebus on Sep 9, 2005 - 16 answers

What interesting things did people do with "big iron" computers in the late '70s and early '80s that is not generally well known, but could be useful to modern computer users? [more inside]
posted by b1tr0t on Jun 30, 2005 - 25 answers