DOS ain't dead

BIOS and memory (Miscellaneous)

posted by Japheth , Germany (South), 25.08.2007, 08:27

> But how is it done ? They support DMA and USB storage - but where do they
> take the memory ? DMA drivers always need XMS

No. A buffer - in XMS or EMS memory - is only needed if the source/destination address isn't DWORD aligned. And if no such buffer is available, the driver will use PIO mode.

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MS-DOS forever!

Complete thread:

• BIOS and memory - DOS386, 25.08.2007, 02:47 (Miscellaneous)
  • BIOS and memory - Japheth, 25.08.2007, 08:27
    • BIOS and memory | no memory needed ? - DOS386, 29.08.2007, 16:03
      • BIOS and memory | no memory needed ? - Japheth, 30.08.2007, 07:38
        • BIOS and memory | no memory needed ? - Jose Antonio Senna, 09.09.2007, 23:59
          • BIOS and memory | no memory needed ? - rr, 10.09.2007, 13:37