Memory allocation: Difference between revisions
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A byte can be stored to the stack with <code>PHA</code> and retrieved with <code>PLA</code>. Later revisions of the 6502 allowed the X and Y registers to be directly pushed/popped with <code>PHX</code>, <code>PHY</code>, <code>PLX</code>, and <code>PLY</code>. The original 6502 could only access the stack through the accumulator.
Shared memory between the CPU and connected hardware is accessed via memory-mapped ports. These appear as memory locations in the CPU's address space. However, they do not necessarily have the same properties as regular memory. Some are read-only, some are write-only, others have unusual behavior.
=={{header|Ada}}==
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