The port list is here:

http://bochs.sourceforge.net/techspec/PORTS.LST

The interrupt list (most of them, if you plan to boot DOS)

http://stanislavs.org/helppc/idx_interrupt.html

Hello there,
I was wondering if I can leave out, say the VGA part, of bochs and then replacing it
with some dump functions, so when I plug in a dumped image of a rom to bochs....
How big is the chance that I can guess what that port or interrupt of the vga bios is doing?
Thanks
Jack

You do not have to guess, you can look at the links I posted. Maybe if you can explain what you are trying to do we can help better.

You can definitely modify bochs to log out any INT 10h instruction (video bios call) and any port out/in in the VGA module. But I am not sure what you would do with that log?

Hello once again,
I am just intending to build an emulator for my old computers.
I got an Intel D865PERL board which I don't have the spec for it.
Thanks
Jack

I am afraid without documentation for that board there is not much you can do. Although you can see what chipset there is on it and check if PCEm or BOCHS have support for it.

Are you planning to add support for that board to an existing emulator (like PCEm or BOCHS) or write your own?