'IBM introduced it in 1981; now more than half of all U.S. homes have one'
PC
2-LETTER ABBREV.: IBM introduced it in 1981; now more than half of all U.S. homes have one
IBM introduced it in 1981; now more than half of all U.S. homes have one
IBM introduced it in 1981; now more than half of all U.S. homes have one
2-LETTER ABBREV.
PC
2-LETTER ABBREV.