computer game submarine pursuit use real computer track unseen sub command combat information center plot ship course nautical chart avoid costly collision aim fire torpedo sub miss target sub retaliatesthe board game match wit computerdecade ago computer develop computer cost million dollar fill entire room extensive research lead electronic company parker brother bring powerful computer design strictly family fun code sector computer capable make thousand calculation second solidstate memory keep track player position time logic circuitry instantly detect collision counterattack misfire hit combat information center contain control need navigate range sub fire electronic readout lightemitte diode automatically display information supply computer computer work track enemy sub nautical chart sink nt easy possible underwater location sub unlikely place twice electronic display provide player complete combat information course game ship direction show light compass steering capability allow player change course left right close sub pair speed control allow destroyer travel different speed evasive sub option make game challenging experienced player program learning sequence teach play quickly easily sonar control area determine range information aim fire torpedoesthe game come complete computer console nautical playingplotting surface mark crayon total crayon sharpener parallel rule replica submarine score total reusable erase cloth volt battery include alkaline battery recommend good result

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