▁( D US ) ▁were ▁port ed ▁over ▁and ▁used ▁in ▁these ▁and ▁future ▁H P 3 0 0 0 ▁models . ▁ ▁Later , ▁the ▁H P 3 0 0 ▁design ▁team ▁over ▁came ▁the ▁first ▁generation ▁H P 3 0 0 ▁slower ▁T TL ▁circuit ry ▁with ▁a ▁S OS ▁design ▁( project ▁name : ▁S izz ler ). ▁Again ▁the ▁G M ▁killed ▁its ▁release ▁and ▁re used ▁its ▁designs ▁in ▁a ▁new ▁H P 3 0 0 0 ▁model ▁ 4 0 ▁( project ▁name : ▁Cub ▁- ▁single ▁card ▁bay ▁stand - alone ▁box ) ▁and ▁the ▁model ▁ 4 4 ▁( project ▁name : ▁G ri zz ly ▁- ▁double ▁card ▁bay ▁table ▁design ). ▁ ▁The ▁H P 3 0 0 0 ▁models ▁ 3 0 , ▁ 3 3 , ▁ 4 0 , ▁ 4 4 , ▁ 4 2 , ▁& ▁ 4 8 ▁went ▁on ▁to ▁great ▁success ▁using ▁what ▁was ▁developed ▁in ▁the ▁H P 3 0 0 . ▁The ▁H P 3 0 0 ' s ▁change ▁to ▁one ▁( at ▁the ▁time ) ▁high ▁speed ▁interface ▁H P - IB ▁channel ▁from ▁H P 3 0 0 0 ' s ▁previous ▁use ▁of ▁many ▁different ▁type ▁internal ▁IF ▁cards ▁rad ically ▁changed ▁and ▁improved ▁future ▁H P ▁system ▁designs . ▁ ▁Develop ed ▁about ▁the ▁same ▁time ▁in ▁Lov eland ▁CO , ▁then ▁later ▁in ▁the ▁same ▁G SD ▁Cu pert ino ▁site , ▁the ▁H P ▁ 2