In this 1985 photograph of Eric Clapton playing his "Blackie" Fender Stratocaster on the late-night talk show "Late Night with David Letterman", it can be seen that the british rock musician uses the Boss DD-2 Delay effect (introduced in 1983) as well as a Cry Baby wah wah pedal and the Boss CE-2 Chorus stomp box. This picture by Chuck Pulin of Star File was taken from the 2004 Christie's auction catalogue for the sale "Crossroads Guitar Auction - Eric Clapton and Friends for the Crossroads Centre", page 194.more
I have Boss DD-3 from 1988 with the same "long chip" that DD-2. Yesterday I finally acquired DD-2 from 1984 and what can I say... the best digital delay on this planet, period. Very bright, pristine and warm - kind of perfect potion of digital and analog delay in one box. DD-2 becomes quite pricy these days, so if you are looking for the same circuit but much cheaper, then get Japanese DD-3 / DSD-2 / DSD-3. They all sounds the same.
My oldest piece of gear out of everything, hahah. It's an all original vintage 1984 DD-2. Pretty much identical to the DD-3s that are still out there, except DD-2s were made with better components, which is why they still work great despite being >30 years old.