17 Parallel Port The inside story on a parallel port: Interface LSI Chip(s) Control Bus (M/IO# and W/R#) Address Bus (16 bits) 8 Data Lines (D0–D7) 5 Status Lines (Busy) 4 Control Lines (Strobe#) Data Bus (up to 32 bits) To/From Processor Chip Physical Connector Ground Reference Lines +5V
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