DMA
> > Put any CDROM/DVD in DMA mode and it will work
> > for a while and then eventually lock the PC up. This is a hardware flaw.
> Doh ! really bad news :-(
> What about watching DVDs ?
> I'm watching DVDs on windoze using a software-only player,
> and without DMA you get nast frameskips ,because the PIO
> transfer uses too much CPU.
> I'm watching DVDs for hours ( DMA enabled) without any lockups.
It may be ultra dma only bug. Im not sure. My DVDROM and CDROM both
support udma.
> But are you sure that every ATAPI CDROM drive on the planet
> has this hardware flaw.
Its the controller not the CDROM at fault
> I stressed my CDROM drives quite a bit, and was unable to lock up the box.
What controller and what drives
> > There is no known software workaround. This is not the ISA DMA bug either.
> > This is a completely different bug.
> Interesting, any pointers for more accurate infos on this topics ?
All the articles on this have long since expired from altavista :-)
> How is this handled my other OSes ?
They dont run DMA.
> > Promise Ultra66. No DMA on CDROM/DVDs. It just wont work. At all.
> PS: why should recent ATAPI CDROM let you set the DMA mode, when they
> know that it could lead to problems ?
Its the controller not the CDROM at fault
-Dan
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