On Wed, 23 Apr 1997 16:56:28 GMT, mycroft@gnu.ai.mit.edu (Charles M.
Hannum) wrote:


>Matthias Drochner <drochner@zelux6.zel.kfa-juelich.de> writes:

>> 
>> btw, can anybody tell me if there is still a 64k DMA boundary for floppy
>> reads in newer PC chipsets?

>Yes, but the BIOS is supposed to take care of this for you.

In my experience (keep in mind this was about 9 or 10 years ago, and on
PC-XTs and clones, so it may not apply any more), this wasn't the case.
Starting with some version of MSDOS (4.0 maybe?) DOS trapped INT 0x13
itself, did any necessary fixup for DMA boundary problems, and passed
things on to the BIOS.