I wrote: >No, all Mockingboards had two sound chips. The earliest boards >only had a socket for one SC-01 voice synthesizer chip, however. >(Later versions had two sockets for SSI-563 synthesizers.) That should be SSI-263...parity error. ;-) -michael Check out amazing quality 8-bit Apple sound on my Home page: http://members.aol.com/MJMahon/