The Dick Smith System 80 was a clone of the TRS-80 Model 1 computer released in 1980.  There were at least four revisions of the System 80 over the years, the last identified as the "Blue Label" model as it had a dark blue label rather than a black one. The Blue Label was the only one to be fitted with internal sound and speaker. This made it great for playing the many TRS-80 games that used the cassette port #1 for producing sound.

This sound module will add Blue Label sound to the earlier Black Label models.  The module includes a volume control which was not included in the Blue Label model and the correct size speaker for the System 80 case. Audio output is muted when using the cassette for saving or loading.

The module consists of a small PCB with four flyleads that need to be soldered to the video board.  It also has plug in connections for the speaker and volume control.

You should only attempt this modification if you are confident with disassembly and soldering, if not you should probably find someone who has these skills to do it for you. We can't be held responsible if bad things happen. As with any vintage computer things can and will go wrong.