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Speculation on why the product was given the number 1130 centered on the following possibilities:
- That, since the 1130 was a small scientific machine, the number was chosen by multiplying 360 (as in IBM 360) by π.
- That 11:30 was the time of day that product planners reached an impasse regarding what to call the product.
- That the 1130 was IBM's 11th Computer Design, and it had 30 instructions.
Others have speculated that the existence of the IBM 1130 explains why no computer designated "11/30" ever appeared in the PDP-11 family of machines.
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