This board uses the GI SPO256-AL2 speech chip from General Instruments, now Arizona Microchip Technologies. Similar circuits with the same chip, had been published in Elektor and Maplin magazines some time ago. The schematic included in the .zip are from No. 36 February 1990 Maplin Magazine. The control data are sent thru the PC parallel port to generate the allophones that form the words. There is included a small TBA820 audio amplifier with adjustable volume to drive a 0.5W loudspeaker. Single side PCB.
