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The Symbios Logic 53C416‑NB is a single-chip, Fast SCSI-2 host controller chipset widely used in ISA plug‑and‑play adapter cards (e.g. SYM20402/03) to provide 16-bit ISA to 8-bit SCSI connectivity. It includes a 128‑byte FIFO and a 24‑bit counter to optimize DMA transfers and reduce CPU overhead, supporting up to seven SCSI devices at up to 10 MB/s data rates
