FaultCertain circuits in the CPU are capable of detecting fault conditions such as illegal instruction. When a Fault is detected, the Interrupt Controller is notified. It reacts by taking control of the CPU for saving PC and F to the stack, then loading the Program Counter (PC) with the content of memory location 0x0001. This behavior, however, can be changed from the computer Console so the computer simply halts on Fault.
This interrupt is not affected by the DI instruction.
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Homebuilt CPUs WebRing
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Project start date: May 13 of 2009
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