cash dispenser, 1967's Barclaycash machine. This proto-ATM used punched paper
The x86 protection model is notoriously complex, with four privilege rings, segmentation, paging, call gates, task switches, and virtual 8086 mode. What's interesting from a hardware perspective is how the 386 manages this complexity on a 275,000-transistor budget. The 386 employs a variety of techniques to implement protection: a dedicated PLA for protection checking, a hardware state machine for page table walks, segment and paging caches, and microcode for everything else.
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随后，IBM 在官方博客中回应称，主机平台的价值与编程语言无关，无论是 COBOL、Java 还是其他语言，平台都能提供一致的性能与安全性。，详情可参考51吃瓜