John wrote: > > In the April 1984 BYTE magazine is "Putting the Apple II Work" > > with plans for a A/D converter using the AD7520 chip. Part 2 > > is in the May issue. I found a spec sheet for the AD7520 at > > www.ele.uva.es/~jesus/perifericos/ad7520.pdf > > Thanks Paul. Wouldn't you know I tossed the old Bytes. A good library would have them on microfilm...