▁were ▁very ▁limited ▁by ▁today ’ s ▁standards , ▁it ▁is ▁impress ive ▁how ▁much ▁the ▁developers ▁were ▁able ▁to ▁accomplish ▁with ▁this ▁seem ingly ▁min usc ule ▁amount ▁of ▁memory . ▁ ▁Video Brain ▁featured ▁a ▁non - standard ▁keyboard ▁with ▁ 3 6 ▁keys ▁and ▁a ▁reset ▁button ▁l abeled ▁“ Master ▁Control ”. ▁ ▁The ▁keys ▁were ▁level ▁with ▁each ▁other ▁and ▁had ▁very ▁little ▁travel ▁when ▁they ▁were ▁struck . ▁ ▁This ▁made ▁typing ▁somewhat ▁difficult ▁and ▁also ▁emphas ized ▁to ▁anyone ▁familiar ▁with ▁computers ▁that ▁the ▁system ’ s ▁capabilities ▁were ▁limited . ▁ ▁The ▁system ▁supported ▁four ▁plug - in ▁jo yst icks ▁and ▁a ▁port ▁on ▁the ▁back ▁that ▁could ▁connect ▁to ▁an ▁ext ender ▁product ▁using ▁propriet ary ▁signal ing ▁over ▁an ▁R S - 2 3 2 ▁physical ▁interfaces . ▁ ▁The ▁ext ender ▁product , ▁and ▁R OM ▁cart ridge ▁that ▁turned ▁Video Brain ▁into ▁a ▁times h are ▁terminal , ▁were ▁sold ▁in ▁very ▁small ▁quantities . ▁ ▁Other ▁connections ▁on ▁the ▁back ▁panel ▁were ▁to ▁the ▁television ▁display ▁and ▁to ▁the ▁external ▁AC ▁transform er . ▁ ▁A ▁switch ▁on ▁the ▁back ▁panel ▁directed ▁the ▁TV ▁signal ▁to ▁channel ▁ 3 ▁or ▁channel ▁ 4 . ▁ ▁The ▁mother board ▁was ▁en closed ▁in ▁a ▁metal ▁shield ▁to ▁meet ▁Federal ▁Communic ations ▁Commission ▁requirements ▁for ▁limit ing ▁radio ▁frequency ▁em issions . ▁ ▁The ▁external ▁case ▁was ▁m old ed ▁pl astic , ▁designed ▁for ▁low - cost ▁high - volume