wengland@stephsf.stephsf.com (Bill England) (09/12/90)
I'm running a ravenously memory hungry Database Application under ODT-DOS. (Merge) Whats worse is the programs taste in memory is exclusively for the extended flavor :-). While Merge allows allocation of 'simulated' expanded memory I could not find any provision for allocating extended memory. On further thought it seems like a difficult proposition to create this feature under Unix. Perhaps I'm overlooking something ... ? Comments? +-------- | Bill England | Stephen Software Systems, Inc., Tacoma Wa. | wengland@stephsf.com +1 206 564 2122 | * * H -> He +24Mev * * * ... Oooo, we're having so much fun making itty bitty suns * * *
sassan@locus.com (Sassan Behzadi) (09/13/90)
In article <363@stephsf.stephsf.com> wengland@stephsf.stephsf.com (Bill England) writes: > > While Merge allows allocation of 'simulated' expanded memory I could not > find any provision for allocating extended memory. ODT-DOS (Merge) *does* simulate EMS, but you will not be able to run programs that go into protected mode in order to access Extended Memory. > On further thought > it seems like a difficult proposition to create this feature under > Unix. Well it ain't easy. A few companies (Microsoft, Quarterdeck, Lotus, Borland, Locus and IGC) are now working on "DOS Protected Mode Interface" (DPMI) which would allow DOS programs to access Extended Memory through a set of "well defined" calls. Operating Systems that support virtual DOS sessions and DPMI (potentially: Windows, DesqView, UNIX, and yes - even OS/2) can allow these DOS programs to access Extended Memory without sacrificing system security. Of course DOS programs have to be re-written in order to use DPMI. So don't expect your current DOS application that goes into protected mode to run under these Operating Systems. --------------------------------------------------------------------- Sassan Behzadi sassan@lcc.COM Locus Computing Corporation ---------------------------------------------------------------------