Hi!
25-Апр-2004 15:36 [EMAIL PROTECTED] (Eric Auer) wrote to
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EA> Content preview: Hi, I thought about ROM/RAM again. Conclusion: X= leave
EA> area mapped 1:1 and untouched (e.g. for ROM areas and video buffers) I=
EA> map RAM to this place to create UMB or EMS page frame RAM= assume that
EA> there already IS RAM at this place, so leave it mapped 1:1 and put UMB
EA> or EMS page frame there ROM= map RAM to this place which contains a
EA> copy of the ROM which was at this place, and mark it read-only (copy
EA> ROM to shadow RAM for speed gain). Notice that most 386/newer computers
EA> already contain shadow RAM functionality anyway (e.g. NeAT 286/386
EA> chipset) so the ROM= function is more or less obsolete. [...]
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EA> Hi, I thought about ROM/RAM again. Conclusion:
EA> RAM= assume that there already IS RAM at this place, so leave it mapped 1:1
EA> and put UMB or EMS page frame there
Wrong. :) I don't know if this is possible with EMM386 (I don't see the
consequent option), but looks like you can't reuse available memory (if it
there) without remapping other over it. RAM= itself, as explained by MS,
only says which region may be used for UMB (if there are no ROMs).
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