(There's no video for MacSpeak yet. Please contribute to MR and add a video now!)
This is the origonal speech synthsizer app that Steve Jobs used to make the mac 128k demo.
(PS: I can't belive how long it took to find this!)
MacSpeak.dsk (400 KiB / 409.6 KB)
MacSpeak / Mini vMac DSK boot disk file / DSK image
So far, I only have the Mini vMac file. I will try to post the .sit file too!
Emulating this? It should run fine under: Mini vMac