Gottlieb multimode sound board systems 6530 replacement
The Gottlieb pinball machines used a sound system made up of a 6503 CPU and a 6530 with D/A converter.
6530-12 or 6530-13 were used in the Gottlieb System 1 sound boards
6530-14 was used in the Gottlieb System 80 series sound boards
A replacement adapter board is produced to repair the often faulty 6530 IC, called the MIOT.
Here is the MIOT manual with complete information on the board.
More information this pinball site, they sell this board!