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4-3

Manual MICOM-2S.Eb

The following table lists standard DOS COM port addresses.

Serial

COM Port

IRQ

Base Hex

Address

Address Switch Settings

A9 A8 A7 A6 A5 A4 A3

COM1 IRQ 4 3F8 1 1 1 1 1 1 1

COM2 IRQ 3 2F8 1 0 1 1 1 1 1

COM3 IRQ 4 3E8 1 1 1 1 1 0 1

COM4 IRQ 3 2E8 1 0 1 1 1 0 1

Table 4-4: Standard COM Port Addresses

Notice that only two interrupts are assigned to four serial ports. "Sharing" interrupts is not a good idea

if both ports are used at the same time.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 31 32

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