User manual

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.