HM1973A Tyme Sefari expander

A Sound Of Thunder is an expansion module for the Tyme Sefari which produces alterations of the recorded audio signal via a series of switches for "circuit bending" the behavior of the module, These switches short out parts of the data and address busses, resulting in effects just like a modified Casio SK-1. The front-panel operation of Tyme Sefari remains predictable when the A Sound of Thunder expansion is active.

Increased Current Draw By Expander

This unit is passive but causes the Tyme Sefari base unit to draw up to 60mA more current.