1) Alternatives to Macs 2) Certain computers 3) Certain PC laptops 4) Certain servers 5) Cloned computers 6) Deep Blue and others 7) Deep Blue and Watson 8) Early PCs 9) Former Apple rivals 10) Longtime PCs 11) Mac rivals 12) Many are cloned 13) Many early PCs 14) Many IT products 15) Many old terminals Found on https://www.crosswordclues.com/clue/ibms