Votrax Oscillator

One of the things that I have been looking at to extend the Galon Oscillator suite is a simulation of the 80's voice synthesizer, the Votrax SC-01A. A chap called Olivier Galibert has been busy un-potting one and reverse engineering the design in conjunction with the patent information. It has been made part of the MAME game engine from where I have taken a snapshot to further tweek into Galon land...

This is the generated transistor logic map from the die image. The most important aspect of this is the ROM table values which weren't in the patent... The code for MAME, which is on GitHub, is a very interesting read. I plan to implement it using some of the MI code such as the noise generator and filters... anyway a work in progress...