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4-9
Serial Port 2 1 2
Auto
1 COM1 COM3
2 COM2 COM4 Off
Auto
IRQ
COM3 IRQ4 COM1 / I/O 3F8h COM3 /
I/O 3E8h
COM4 IRQ3 COM2 / I/O 3F8h COM4
/ I/O 3E8h
378h 278h 3BCh
Off
AT PS/2
Parallel Mode
Auto
2 COM IRQ
2 COM3 COM4
ECP extended capabilities port 278h