Photo 7   The second test interface built, was intended for clearly demonstrating the three 8 bit locations used by the printer ( parallel ) port, and included three sets of 8 LED lights. This interface also has 8 relays ( switches ) which turn on or off with the 8 LED's. This allows 8 devices such as motors or lights, to be turned on or off, connected to a toy "robot". The 'robot' can also send 5 different signals back to the computer, such as " I have hit an object", or " It is now dark in front of me" etc. The BASIC program can then respond to the situation, for example, by backing up the robot, if it hits an object. This allows kids to develop "real-life" programs.
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