Hi!
22-Июн-2004 09:46 [EMAIL PROTECTED] (Aitor Santamarэa Merino) wrote to
[EMAIL PROTECTED]:
ASM> One more opinion on this topic. I don't think it's a good idea that the
ASM> UMBs are chained into the main MCB chain.
This is property of the EMM386. But you may do (and undo) this also
manually at any time with help of utilities like VIDMEM from QEMM package.
ASM> UMBs are different from other memory blocks. For instance, if you are
ASM> using EMM386 to provide UMBs, you may get troubles with DMA because of
ASM> the mismatch of linear and physical addresses.
FD currently compares buffer address (in dsk.c and blockio.c) with
explicit A000 when decising to use internal buffer for disk IO, so no
problems.
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