don't know, developing the s360 line cost ibm 5 billion $ [1] (that was quite a bit of a moon shot, given that the moon program has cost 25 billion $ [2]). Mayb

don't know, developing the s360 line cost ibm 5 billion $ [1] (that was quite a bit of a moon shot, given that the moon program has cost 25 billion $ [2]). Maybe it would have cost them less if the s360 instruction set had a stack, but who knows. In any event this price tag pursuaded them to clone the whole thing. [1] https://spectrum.ieee.org/tech-history/silicon-revolution/building-the-system360-mainframe-nearly-destroyed-ibm https://spectrum.ieee.org/tech-history/silicon-revolution/bu... [2] https://money.com/apollo-11-moon-mission-cost/ https://money.com/apollo-11-moon-mission-cost/