DESCRIPTION:  This is the original BASIC Stamp, operating in many custom projects since its introduction in 1992. The Rev. D's abilities are often underestimated when compared to the BS2 and BS2p, but chances are many of our customer's programs could be squeezed into this BASIC Stamp. Although the low cost of entry is enticing, we suggest that beginners start with the BS2 because there are more learning tools available for the BS2-IC.