18E is an outstanding debug monitor for use in developing software for the Zilog Z80 and Hitachi HD64180. Based on Z8E by Richard Surwilo, 18E offers the following features and fixes in addition to all the capabilities of Z8E: - HD64180 assembly/dissambly support via modified A, J, S, X and Z commands - HD64180 I/O register access support via modified N and Q commands - Auxiliary debug terminal support (accessable via the new T command) to facilitate software development of screen oriented applications - RUBOUT as well as BACKSPACE for line entry character delete - Fixed cursor address bug which occurred while tracing an EXX or EX AF,AF' instruction via the J command (animated full screen debug mode) With both HD64180 and auxiliary terminal support activated (see installation section of 18E.DOC), the 18E monitor still occupies less than 9.5K bytes. Damon R. Gibson