Back to home page

DOS ain't dead

Forum index page

Log in | Register

Search:  
Back to the forum
Board view  Mix view

SB Live DOS emulation - my fight with SERR# to NMI routing (Developers)

posted by Japheth Homepage, Germany (South), 19.05.2008, 13:03

> But it (SBEMU) have a lot to do with NMI. Please read
> this
> message from Creative support forum. And I proved that it is a
> minimum requrement. When I have normally disabled SERR#->NMI I cannot hear
> ANY sound from SFX/MIDI/Adlib. When I enable SERR#->NMI route it can play
> MIDI and Adlib. So you see that it does matter.
There might be different models for which they implemented different approaches. The NMI approach has severe limitations, so they might have changed their strategy. Anyways, IIRC I once verified that the DOS drivers for my SB Live don't touch the NMI vector in the IDT, which is a pretty good evidence that NMI is not used.

> What means "fully compatible legacy DMA controller to be installed"?
> You mean compatible hardware or some BIOS routines?
I mean hardware, since the legacy DMA controller is known and documented.

> I don't know how can DMA on new chipsets differ to DMA in older chipsets.
> E.g. FDC uses DMA too but I don't know if it is really used and working.
> And if the differences are permanent or it can be configured in chipset
> registers.
But if the FDC and/or DMA is "non-standard" in your MB, wouldn't that mean that you'll need a driver to run - say - Win98 on it? I'm not sure, but I bet the FDC in Win98 is accessed by protected-mode drivers supplied with the OS, and not by BIOS interrupts.

---
MS-DOS forever!

Post reply
 

Complete thread:

Back to the forum
Board view  Mix view
22752 Postings in 2119 Threads, 402 registered users (1 online)
DOS ain't dead | Admin contact
RSS Feed
powered by my little forum