How to setup irq and i/o for com1 to com8

[hon123456]

Dear all,

I want to add 7 serial com port to my computer, totally, there
will be 8 comport. As I am not familiarized with comport setting. so
please suggest the best setting for 8 serial com port. What is the
(maximum) legal range of i/o address that I can use. And what is the
(maximum)legal range of irq that I can use. Can I assign same irq
number to different com port? Or should I arrange a unique irq and i/o
address to the com port.

Please suggest your solution as follows:

i/o irq
com1
com2
com3
com4
com5
com6
com7
com8

Thanks for your help.

 

[Nick Burns]

Install the cards and let windows do the rest.

 

[Jerry]

Don't know about 8 ports but the standard for four is:
Com 1 = 3F8h to 3FFh 4
Com 2 = 2F8h to 2FFh 3
Com 3 = 3E8h to 3EFh 4
Com 4 = 2E8h to 2EFh 3

 

[Si Ballenger]

Dear all,

I want to add 7 serial com port to my computer, totally, there
will be 8 comport. As I am not familiarized with comport setting. so
please suggest the best setting for 8 serial com port. What is the
(maximum) legal range of i/o address that I can use. And what is the
(maximum)legal range of irq that I can use. Can I assign same irq
number to different com port? Or should I arrange a unique irq and i/o
address to the com port.

Please suggest your solution as follows:

i/o irq
com1
com2
com3
com4
com5
com6
com7
com8

Thanks for your help.

Unless you are using some old hardware, most current comport
adapters now use virtual comports which share irq 9 if they are
hardware adapters, and if they are USB based, they may not use an
irq. What does your your comport adapter maker say?

 

[Yves Leclerc]

Do not buy three extra 2 port COM port card. Buy a special intelligent
multi-serial port adapter. These type of card have a special "processor" to
handle the extra ports and may only use 1 IRQ/DMA channel.

Check with one such manaufacturer:

www.digi.com