The Stack The stack is defined as a special area in memory. Indeed it is because

Question

The Stack

The stack is defined as a special area in memory. Indeed it is because it provides the CPU an ability to (i) recover from unexpected occurrences, (ii) to recover from intended user interrupts, (ii) to perform data transfers between subroutines, (ii) it provides the user with a place to temporarily store contents of the CPU registers while other unrelated or related computations are being performed.

SP=Stack Pointer, PC=Program Counter, IX=Index Register X, IY=Index Register Y, ACCA=Accumulator A, ACCB= Accumulator B and CC=Condition Code Register

CPU Registers have: SP $0000, PC $D010, IX $1000, IY $FFFE, ACCA $A0, ACCB $B1, CC $99

a)      Would any PUSH instruction to the current stack area pointed to by SP be valid? Explain

b)      Please provide a stack frame resulting from loading SP with $00FF and storing IX, IY, ACCA, ACCB, CC and PC.

c)       Provide a list of instructions that would load the SP with $00FF and store all the CPU registers in this area.

d)      Provide a list of instructions that would restore the CPU registers and show what is in SP and the stack area once the registers have been restored.

Explanation / Answer

1. (ii) to recover from intended user interrupts

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