ins , ▁and ▁Gene ▁A . ▁Fr ant z ▁and ▁its ▁sil icon ▁was ▁laid ▁out ▁by ▁Larry ▁Br ant ingham . ▁The ▁chip ▁was ▁designed ▁for ▁the ▁' Sp elling ▁Be e ' ▁project ▁at ▁T I , ▁which ▁later ▁became ▁the ▁Spe ak ▁& ▁Sp ell . ▁A ▁speech - less ▁' Sp elling ▁B ' ▁was ▁released ▁at ▁the ▁same ▁time ▁as ▁the ▁Spe ak ▁& ▁Sp ell . ▁ ▁All ▁T I ▁L PC ▁speech ▁ch ips ▁until ▁the ▁T SP 5 0 c xx ▁series ▁used ▁PM OS ▁architecture , ▁and ▁L PC - 1 0 ▁encoding ▁in ▁a ▁special ▁T I - specific ▁format . ▁Ch ips ▁in ▁the ▁T I ▁L PC ▁speech ▁series ▁were ▁l abeled ▁as ▁T MC xxxx ▁or ▁CD xxxx ▁when ▁used ▁by ▁T I ' s ▁consumer ▁product ▁division , ▁or ▁l abeled ▁as ▁T MS 5 xxx ▁( l ater ▁T SP 5 xxx ) ▁when ▁sold ▁to ▁ 3 rd ▁parties . ▁ ▁T I ▁L PC ▁Spe ech ▁chip ▁family ▁ 1 9 7 8 ▁T MS 5 1 0 0 ▁( T MC 0 2 8 1 , ▁internal ▁T I ▁name ▁is ▁' 0 2 8 0 ' ▁hence ▁chip ▁is ▁sometimes ▁l abeled ▁T MC 0 2 8 0 ): ▁First ▁L PC ▁speech ▁chip . ▁U sed ▁a ▁custom ▁ 4 - bit ▁serial ▁interface ▁using ▁T MS 6 1 0 0 ▁or ▁T MS 6 1 2 5 ▁mask ▁R OM ▁IC s