2.4 mm³ isotropic
Besides the Test PLA, the 386 has another PLA called the Entry PLA that maps opcodes to microcode entry points. One of its input bits is a "protected mode" flag. Many instructions have both a real-mode and a protected-mode entry point -- for instance, MOV ES, reg maps to address 009 (a single microcode line) in real mode, but to 580 (which initiates a full descriptor load with protection tests) in protected mode. The trick that makes V86 work is to define this flag as:
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Know your rights.
On the other side of the bars from Friedmann, Hall was asking similar questions about the cruelties of incarceration. People who work in corrections often speak of their talents as lying in one of two directions. You’re either a “security person,” most concerned with controlling inmates, or you’re a “programming person,” interested in helping them occupy their minds, perhaps to learn and grow. As a case manager in the Criminal Justice Center, Hall realized that he was a programming person. But such work was an afterthought there, so in 1991 he left to be the program director at a C.C.A. jail, in Davidson County, that was comparatively well managed. He created educational and community-interaction programs for the inmates.
后来，我们采访过一个英国牛津大学的创业团队 Exo Labs。他们用 4 台 512GB 统一内存的 Mac Studio，通过串联的方式组成了一个 128 核 CPU、320 核 GPU、2TB 统一内存、总内存带宽超过 3TB/s 的算力集群。