<p>IBM is expected to unveil today its next-generation mainframe computer, a more powerful version of the system that once generated at least 80 percent of its profits.</p>
<p>Even though IBM has become more of a services company in recent years, the mainframe is still a key product for the world's largest computer maker. Despite IBM's code-name for the product -- T-Rex, a tongue-in-cheek reference to the constant dismissal by competitors that the mainframe is a dinosaur -- the mainframe is far from death's door.</p>