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The MERLIN board was designed as a software programmable display and was, therefore, dependent on software for control. In the most common usage of MERLIN, the "MERLIN BASIC INTELLIGENCE (MEl) ROM" was used and had to be purchased to provide this software control. The MEl software was programmed to accept command input from a modified ASCII keyboard via MERLIN's on-board keyboard port. Neither the MBI ROM nor keyboard input through the on-board port was required however for operation of the MERLIN Video Interface. The keyboard and ROM were simply the most direct and easiest approach to a fully get a fully operational video terminal.
This page was last modified on 10/25/2013