I/O operation status
Memory refresh output
Output pulse on instruction fetch cycle
Interrupt request input
Answer is Right!
Answer is Wrong!
The correct answer is: C. Output pulse on instruction fetch cycle.
The M1 signal is a pulse that is generated by the Z80 microprocessor during the instruction fetch cycle. It is used to signal to external devices that an instruction is being fetched from memory.
The other options are incorrect because:
- Option A is incorrect because the I/O operation status is not signaled by the M1 signal. The I/O operation status is signaled by the I/O request signal (IORQ).
- Option B is incorrect because the memory refresh output is not signaled by the M1 signal. The memory refresh output is signaled by the memory refresh control signal (MEMR).
- Option D is incorrect because the interrupt request input is not signaled by the M1 signal. The interrupt request input is signaled by the interrupt request signal (INTR).