One of the reasons the 3614 is obscure is that its replacement, the IBM 3624
pretty much the same basic architecture as the many ATMs that followed. It's
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V86 mode is entered through IRETD when the VM bit is set in the stacked EFLAGS. The microcode detects this with a conditional jump:
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"But you need an oil price that makes that worthwhile. Unless you can generate sufficient money to justify that, it's very difficult to see the industry coming back."