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In page PDP-8:
"New I/O instructions to the Memory Extension Controller retrieve the current value of the data and instruction fields, letting software save and restore most of the machine state across a trap. However, a program can not sense whether the CPU is in the process of deferring the effect of a CIF instruction (whether it has executed a CIF and not yet executed the matching jump instruction). The manager has to include a complete PDP-8 emulator (not difficult for an 8-instruction machine). Whenever a CIF instruction traps to the manager, it has to emulate the instructions up to the next jump. Fortunately, as a jump usually is the next instruction after CIF, this emulation does not slow programs down much, but it is a large workaround to a seemingly small design deficiency.[citation needed]
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