The TI chip can output up to 10 mA, which begs for some amplification. A few components I had bought or salvaged a while ago were looking at me with begging eyes, so this provided a good excuse to indulge.

The first installment in a series were we build a MIDI instrument from a bunch of SN76489s. In this article, we concentrate on setting up communication with a an SN76489 and getting some sound out of it.