, ▁Digital ▁Del ay ▁( I ke ▁H amma ), ▁B ion do , ▁Davis , ▁D & D ▁( D anny ▁D uber ry ) ▁and ▁others ▁figure ▁prom in ently ▁in ▁the ▁history ▁of ▁drag ▁racing ▁delay ▁boxes . ▁Some ▁of ▁the ▁gl ue ▁logic ▁type ▁designs ▁had ▁large ▁LED ▁( light ▁em itting ▁di ode ) ▁read outs ▁to ▁display ▁the ▁timer ▁setting , ▁others ▁featured ▁attract ive ▁back light ed ▁L CD s ▁( liqu id ▁cry stal ▁displays ), ▁still ▁others ▁used ▁thumb w he els ▁of ▁varying ▁size ▁and ▁quality . ▁All ▁delay ▁boxes ▁on ▁the ▁market ▁were ▁quart z ▁cry stal ▁accurate ▁by ▁the ▁year ▁ 1 9 9 0 . ▁Several ▁years ▁el apsed ▁before ▁other ▁delay ▁box ▁designs ▁appeared ▁with ▁embedded ▁micro process ors . ▁ ▁Today , ▁virt ually ▁all ▁drag ▁race ▁delay ▁boxes ▁are ▁micro processor ▁based ▁with ▁intellig ent , ▁back lit ▁L CD ▁read outs . ▁The ▁most ▁popular ▁models ▁feature ▁internal ▁c ros so ver ▁time ▁computation ▁( allow ing ▁a ▁driver ▁to ▁pick ▁a ▁visual ▁c ue ▁from ▁his ▁oppon ents ▁side ▁of ▁the ▁Christmas ▁tree , ▁the ▁delay ▁box ▁internally ▁does ▁simple ▁math ▁comput ations ▁for ▁the ▁driver ), ▁b ump ▁up ▁and ▁b ump ▁down ▁compens ation ▁( all ows ▁a ▁driver ▁to ▁easily ▁make ▁small ▁plus ▁or ▁minus ▁timing ▁adjust ments ▁quickly ▁and ▁rem ot ely ), ▁c ros so ver ▁compens ation ▁( an ▁offset ▁time ▁the ▁driver ▁can ▁set ▁when ▁crossing ▁over ),