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Re:The IBM System/360: the first modular, general-purpose co... by Animats on Thursday August 25, 2016 @03:16PM (#12361651)
That's probably inflation-adjusted. It was about $1 billion at the time. [1]

[1] http://ds-wordpress.haverford.edu/bitbybit/wp-content/upload...

Re:The IBM System/360: the first modular, general-purpose co... by dalke on Thursday August 25, 2016 @03:53PM (#12361959)
That was the original development cost, in early 1960 dollars. The remaining $4 billion was manufacturing costs.