Actually thats not correct. IBM went to Kildall and tried to bully him into signing over so much of the rights to CPM as part of the deal that he refused. He himself suggested they talk to Bill G, in the end neither were willing to sign it all over to IBM so it struck a deal with both of them offering to let the market decided which was best. The IBM machines could be bought by Joe Public with either CPM or DOS. Kildall foolishly assumed this meant they would be priced the same and that the market would decide. At the time CPM was considered to be the "Serious" option of the two, and IBM added CPM as an option but for $250 ish extra. DOS as the less hardcore version was a mere $30. The market voted with its wallet.
