[rescue] Slightly OT: ?Bad Cap Saga

Joshua Boyd jdboyd at jdboyd.net
Thu Aug 21 11:41:35 CDT 2008

On Thu, Aug 21, 2008 at 02:53:59AM -0400, der Mouse wrote:

> > You might be able to connect them to a bus, but they are limited to
> > 16 megabytes of memory.  Windows 95 and Linux version 1 had device
> > drivers that would compensate, but does Vista or Linux 2.6?
> I have no idea, since I don't even use, much less hack on, either.  I'm
> fairly sure NetBSD does (or at least easily could); they call them
> "bounce buffers" and they use them for very analogous but more common
> situations, cases where a DMA device can access only part of the
> system's RAM - this is not as unusual as situation as you seem to think
> it is.

Linux has bounce buffers since apparently a lot of PCI cards can only
work in the first gig of memory space.

Performance is bad, which isn't likely to be an issue for ISA cards on
modern systems.

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