Microprocessor
The stack is nothing but a set of

 reserved RAM address space
 reserved I/O address space
 reserved ROM address space
None of these

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Microprocessor
A high on RESET OUT signifies that

 all the registers of the CPU are being reset
 all the registers and counters are being reset and this signal can be used to reset external support chip
 all the registers and counters are being reset
 processing can begin when this signal goes high

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