3 ms·
You are describing segmentation from the 286 protected mode and later. Real mode segmentation, originally introduced in the 8086/8088, is and always was an abom
by beagle3 7y ago
You are describing segmentation from the 286 protected mode and later. Real mode segmentation, originally introduced in the 8086/8088, is and always was an abomination, even if you don't compare it to the elegance of the contemporary 68000/68008.
- monocasa 7y agoWell, and GE-645 (ie. the special purpose MULTICS machine), the iAPX 432 (that Intel chip that gets a bad rap), the Plessey 250, and the CAP computer off the top of my head. ie. anywhere that describes the segment base, limit, and permissions on a separate privileged table.
- tempguy9999 7y ago> that Intel chip that gets a bad rap I wonder why. <<<According to the New York Times, "the i432 ran 5 to 10 times more slowly than its competitor, the Motorola 68000" >>> https://en.wikipedia.org/wiki/Intel_iAPX_432#The_project%27s_failures https://en.wikipedia.org/wiki/Intel_iAPX_432#The_project%27s... From memory a quote from a user of it, something like: "on a good day it walked, on a bad day it crawled" IIRC every main memory access needed 3 pointer derefs and 3 array lookups (from memory).