The link says "$5,000,000,000 in 1964 is equivalent in purchasing power to about $44,968,064,516.13 today", which is $45 billion. Considering that the entire r

The link says "$5,000,000,000 in 1964 is equivalent in purchasing power to about $44,968,064,516.13 today", which is $45 billion. Considering that the entire revenue for IBM in 1964 was $3.2 billion (1964 money), spending $5 billion on a project (over several years) was certainly a "bet the company" move.