The "com" ports are computer, serical communications ports (normally RS-232).
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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
Yes on a modern computer you will need a USB to 9 pin RS232 converter or previously use the LPT parallel port.
The port that is connected can either be COM1 or COM2 depending on the communication port.
COM2 typically uses IRQ 3. The Interrupt Request (IRQ) is a signal used by hardware devices to get the attention of the CPU. In the case of COM2, which is a communication port, it uses IRQ 3 to communicate with the CPU for data transmission and reception.
IRQs 3 is reserved for the COM1 port.