Vision of Personal Computers As Heart of Home Entertainment
Intel and Microsoft, competing directly against many companies in consumer electronics industry, are mounting new charge to make personal computer heart of home entertainment systems; arrival of all-in-one PC's that combine television tuner, video game machine, stereo jukebox, DVD player and digital photo archive, is aimed at letting computer industry make big inroads into consumer market as digital television replaces conventional analog TV; new device known as Media Center PC, with processing designed by Intel and software by Microsoft, leads computer industry's invasion; photo (M)