Microprocessor
SUB A instruction in 8085

 sets zero and carry flags
 reset carry and sign flags
 sets zero and sign flags
 reset zero and parity flags

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Microprocessor
The stack pointer register in a microprocessor

 counts the number of programs being executing on the microprocessor
 keeps the address of the next instruction to be fetched
 counts the number of instructions being executing on the microprocessor
 holds the address of the top of the stack

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