Not quite as high as a SR-71
A SR-71 reached 85Km, you would expect a rocket plane to get to a higher altitude than an air-breathing aircraft.
7 posts • joined 18 Mar 2011
For backward compatibility with existing 24 bit applications!
The end of a list of parameter pointers is marked by setting the high-order bit in the last address. If they went to 32-bits, all 24 bit application would break since you could not determine whether an address with the high-order bit marked the end of the parameter list or was a value larger than 2GB.
Going with 31-bits only meant executables built in the 60's and 70's can (potentially) still run under current versions of the hardware and the OS.
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