From: James L. Paul (james@netcom.com)
Date: 10/01/92 

From: james@netcom.com (James L. Paul)
Subject: 0.98 and serial ports, IRQs
Date: Thu, 1 Oct 1992 17:03:57 GMT

I've been using linux 0.97.2 for some time with 4 serial ports, set up
with 2 cards. One card has two 450 chips, and the other has two 550A
chips. I'm using IRQs 2,3,4, and 5 for these.

I noticed in 0.97.6 and above (0.98) that serial has been extensively
changed. I'd like to add up to 8 more ports. What is my best option for
doing this?

1. Can I add more 2-port cards and share IRQs? How do I set this up?

2. Can I add 2 AST Fourport cards to get a total of 12 ports? How?

3. Can I get 4 or 8 port cards other than the AST? Which cards work?

4. What issues are involved with sharing IRQs between ports on a board?

5. What issues are involved with sharing IRQs across boards?

6. If I set 2 ports to the same IRQ, do they also share the COM address.

Thanks! Perhaps I can summarize this. 

-- 
James L. Paul

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