Possible parallel port addresses are:

 Hex   Port IRQ
 ----  ---- ---
 0378h LPT1  07
 0278h LPT2  07
 03BCh LPT3  05

Possible serial port addresses are:

 Hex    Dec   Port IRQ
 -----  ----  ---- ---
 03F8h  1016  COM1  04
 02F8h  760   COM2  03
 03E8h  1000  COM3  04
 02E8h  744   COM4  03

 03E0h  992   COM5  03
 02E0h  736   COM6  03
 0338h  824   COM7  03
 0238h  568   COM8  03

-end-

Port BIOS values:

 BIOS       Port
 ----       ----
 0000:0400  COM1
 0000:0402  COM2
 0000:0404  COM3
 0000:0406  COM4

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