Subject: Re: Snapshot report - June 20th tar_files
To: Ted Lemon <>
From: Michael L. VanLoon -- <>
List: current-users
Date: 06/24/1995 11:00:15
>The PCI/ISA chipset on the ASUS board that I have supports better DMA
>for ISA devices, so that you can DMA anywhere in the address space,
>even from or to an ISA device.  I think this is a pretty common

How is this possible with only 24 address lines?  Does the ASUS board
also put extra address lines on the ISA socket?  Which add-in boards
would support this?

>chipset, and there may be similar functionality available in some
>modern EISA chipset - maybe support for this stuff should be
>considered along with bounce buffers?

Any fully-functional EISA chipset automagically works in 32-bit
addressing per EISA spec.  EISA DMA isn't ISA DMA.  If EISA doesn't
work this way, it's broken.

  Michael L. VanLoon                       
       --<  Free your mind and your machine -- NetBSD free un*x  >--
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