Hi,
I found a few tubes of NOS, SP0256A-080's in one of my older chip boxes today:) They are used for speech, robot kits etc and pretty hard to find new. They are 86 date codes, and the cost is $12 shipped in the US and $15 worldwide. I can also sell all 30 pcs for $225 shipped worldwide. Here is a little info from the web on the chip:
The SP0256-080 produces all 59 phonemes of the English language plus 5 pauses of different durations. This is the simplest approach to universal speech synthesis and the speech quality makes for a good robot voice. Each of the phoneme's speech patterns are individually addressable, making the SP0256-080 capable of saying anything that can be said in the English language. This chip is rare and getting harder to find! Features: Cool "Retro" Robotic Speech * Stand Alone Operation with inexpensive support components * Allophone Synthesis.
Thanks, Mark Capps