At 10:21 AM 7/30/2005 +0800, Johnson Lam wrote:
Will this affect some old DOS programs that work under MS-EMM but failed under FD-EMM?
Don't have any reports of this happening regarding VDS function failure, so that's a rather theoretical question.
Per-spec exclusion of internal remapping and DMA buffers has to be tolerated by any program using VDS. Even if a VDS driver does allow those actions, the actions cannot be guaranteed to happen because they require resources that may not be present or memory maps that may not be available. Disallowing them therefore is effectively the same as not be able to do it. Successful action on use of a DMA buffer or a memory remap request is always considered optional. Error return codes and partial memory maps or contiguity counts for functions attempting the actions must always be respected.
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