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well COM1, COM2, COM3, and COM4 are sometimes configured as Serial Ports.

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Q: What system resources does COM3 use?
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What system resources does com1 use com2 com2 com3 com4?

COM1-IRQ 4, memory addresses 03F8-03FF COM2-IRQ 3, memory addresses 02F8-02FF COM3-IRQ 4, memory addresses 03E8-03EF COM4-IRQ 3, memory addresses 02E8-02EF pg. 396


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