[Verse 1] Processors whisper secrets through their pins Memory mapped windows where the magic begins Address zero-x-four-zero-zero waits Your data packet at the register gates [Chorus] Memory mapped, port I-O Two pathways where the data flows Device registers hold the key Control structures set you free Memory mapped, port I-O Hardware speaks what software knows [Verse 2] Status bits like traffic lights command Ready, busy, error flags expand Control registers orchestrate the dance While data buffers give each byte a chance [Chorus] Memory mapped, port I-O Two pathways where the data flows Device registers hold the key Control structures set you free Memory mapped, port I-O Hardware speaks what software knows [Bridge] Poll the status, check the state Interrupt handlers never wait DMA controllers steal the show Moving blocks while processors go slow [Verse 3] Memory mapped feels just like RAM Same address bus, same access plan But port I-O needs special calls Separate space beyond memory walls [Chorus] Memory mapped, port I-O Two pathways where the data flows Device registers hold the key Control structures set you free Memory mapped, port I-O Hardware speaks what software knows [Outro] From keyboard scans to disk array Register fields guide the way Hardware communication clear When you know which path to steer
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