2SP-550, Two serial ports (9 & 25 pin), 16550 UARTs, IRQ2/3/4/5/10/11/12/15, COM 1-4; one 25-pin bi-dir. parallel port, LPT 1-2, IRQ 5/7
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2SP-550, Two serial ports (9 & 25 pin), 16550 UARTs, IRQ2/3/4/5/10/11/12/15, COM 1-4; one 25-pin bi-dir. parallel port, LPT 1-2, IRQ 5/7
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