The TLA7012 portable logic analyzer mainframes are modular mainframes that accept TLA logic analyzer and pattern generator modules. The TLA7012 can be configured as either master or expansion mainframes to provide solutions for large numbers of buses and high channel count requirements. The TLA7012 Portable Mainframe is built on a Microsoft Windows XP Professional PC platform that offers a familiar work environment for the TLA application software. The TLA7012 Portable is available with multiple display capability for extended desktop viewing, in addition to an internal DVD-RW, hard drive, and multiple USB2.0 ports for expansion. A replaceable hard drive is standard on both mainframes, ideal for security or enabling individual team members to store personal setups and data. Trigger in/out connections provide an interface to other external instrumentation, such as TDS oscilloscopes, for correlating measurement results.