Nearly every protection-related instruction -- far CALL, far JMP, far RET, INT, IRET, MOV to segment register, task switch -- needs to load a segment descriptor from the GDT or LDT. The 386 microcode centralizes this into a shared subroutine called LD_DESCRIPTOR, which reads the 8-byte descriptor from memory and feeds the high DWORD (containing Type, DPL, S, and P bits) to the Test PLA for validation.
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I first tried out the Naya Create during CES 2025 and was immediately smitten with the design. It’s a deliriously well-made fully-split keyboard with built-in modules at each thumb. You can swap in a trackball, dial, trackpad and the Float module — a dial/joystick combo for manipulating 3D imagery.