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From:   "Maciej W. Rozycki" <macro@orcam.me.uk>
To:     Nikolai Zhubr <zhubr.2@gmail.com>
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Subject: Re: Realtek 8139 problem on 486.
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On Thu, 24 Jun 2021, Maciej W. Rozycki wrote:

>  Anyway, this the ALi M1489/M1487 chipset and no datasheet is easily 
> available (perhaps Nvidia, which bought the chipset part of ALi back in 
> 2006, has a copy, but I wouldn't bet on it).  A product brief is available 
> that says the chipset supports PCI steering, but we can only guess how it 
> works.

 I have actually tracked a datasheet down now, so I'll see what I can do.  
The southbridge has a separate edge/level trigger mode control register 
for PIRQ lines in addition to the usual ELCR register, so it will require 
extra handling and the wording is not as clear as with Intel documentation 
(understandably), so it may require further experimentation.

  Maciej