Why Raising VC Too Early Is the Fastest Way to Kill Your Startup
You never knew exactly what you were going to get. I remember one program listing printed on the side of a bird that, when run, produced a series of wild chirping noises from the Apple’s speaker. And this was from a program that was only five to ten lines long. As a neophyte BASIC programmer myself, I was stunned and amazed. How could you make something this cool with this small amount of code? […]
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The main rule for data access is max(CPL, RPL) ≤ DPL. For code transfers, the rules get considerably more complex -- conforming segments, call gates, and interrupt gates each have different privilege and state validation logic. If all these checks were done in microcode, each segment load would need a cascade of conditional branches: is it a code or data segment? Is the segment present? Is it conforming? Is the RPL valid? Is the DPL valid? This would greatly bloat the microcode ROM and add cycles to every protected-mode operation.
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