Two of my SP0264-021s next to my SP0256A-AL2 A year or so back, I was wanting to see how I could add voices to my Arduino projects. After some research, I came across the SP0256 series of speech synthesis chips. I decided I needed to get my hands on the SP0256A-AL2 variant, which could produce any word via a set of allophones . The SP0264 is a chip in the same series, apparently slightly newer. It's pin for pin compatible with the SP0256, so when I saw some with the number "SP0264-021" on eBay, I thought "The number on it is slightly different, but the datasheet says "Natural Speech", so it must be the same, right?". Wrong. After buying one, then two more after I thought I'd blown the first one, I hadn't been able to get any more than noise, static that at times almost sounded like something but definitely wasn't what it was supposed to be. Frustrated and disappointed, I gave up and stuck them in a drawer somewhere. Later, I got
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