▁ ▁The ▁Int ell iv ision ▁III ▁was ▁to ▁be ▁an ▁upgrad ed ▁but ▁back ward ▁compatible ▁system ; ▁based ▁on ▁a ▁similar ▁CP 1 6 1 0 ▁processor ▁and ▁with ▁an ▁improved ▁graphics ▁ST IC ▁chip ▁producing ▁double ▁the ▁resolution ▁with ▁more ▁spr ites ▁and ▁colors . ▁ ▁The ▁Int ell iv ision ▁III ▁existed ▁in ▁the ▁lab ▁and ▁a ▁new ▁EX EC ▁was ▁written ▁for ▁it ▁but ▁little ▁else . ▁ ▁It ▁was ▁cancel led ▁in ▁mid - 1 9 8 3 . ▁ ▁A ▁Matt el ▁document ▁called ▁Target ▁Spec ification ▁Int ell iv ision ▁III ▁has ▁the ▁following . ▁ ▁CPU : ▁ ▁CP 1 6 1 0 - 2 ▁at ▁ 3 . 5 6 ▁M Hz ▁( 2 x ▁original ▁CPU ▁speed ) ▁ ▁separate ▁ 1 6 - bit ▁data ▁bus ▁and ▁address ▁bus ▁ ▁multiple x ed ▁data / address ▁mode ▁for ▁back ward ▁compatibility ▁with ▁existing ▁cart rid ges ▁Graphics : ▁ ▁ST IC ▁ 1 B ▁ ▁t iled ▁graphics , ▁ 2 0 ▁cards ▁by ▁ 2 4 ▁rows ▁▁ 2 - color ▁ 1 6 x 8 ▁pixel ▁cards ▁for ▁a ▁resolution ▁of ▁ 3 2 0 x 1 9 2 ▁▁ 4 - color ▁ 8 x 8 ▁pixel ▁cards ▁for ▁a ▁resolution ▁of ▁ 1 6 0 x 1 9 2 ▁▁ 4 0 ▁x ▁ 2 4 ▁al phan umer ics ▁▁ 1 6 ▁program m able ▁colors ▁ ▁color ▁p alette ▁select able ▁per ▁card ▁▁ 1