> On Jul 1, 2016, at 4:17 PM, Rugxulo <rugx...@gmail.com> wrote: > > Hi, > >> On Tue, Jun 28, 2016 at 10:08 AM, Eric Auer <e.a...@jpberlin.de> wrote: >> >> I think that even 597 kB of low DOS memory is plenty for old DOS programs. > > "597 kb should be enough for anyone." -- Eric Auer, 2016 :-) > > In Abe's recent screenshot, he shows that he's now getting (thanks to > Ulrich) "628 kb" free. This is actually "643,488" bytes! That's > plenty! (It's easy to forget that "kb" is not equal to 1000.) > > Seriously, I can't speak for all apps, but it's rare to need (much > more, if any) greater than 500 kb. Needing 600 kb is almost unheard of > (right??). At least, I only vaguely remember one demo (submerge??) > that needed over 600,000 bytes free. And even that was probably badly > designed. Some games require more than 500 kb, but that too is of > questionable design. Most well-behaved apps (yeah, I know that's not > saying much) don't really need that much. > > My own VBox setup "only" gets 596 kb (610,544) free. That's HimemX > only (and FreeCOM XMS_Swap, of course; and yes, packet driver can vary > a lot in size, too). I can't remember exactly, but my native FreeDOS > install is also similar, and I see no huge problems. Though it's > impossible to test everything, of course. > > Can anyone provide real-world usage examples of needing 600,000 bytes > or more free?? (Besides obvious things like user data or combining > several TSRs.) Do any popular apps from yesteryear need that much? > I don't have any real-world data for apps, but I'm interested in learning how games like DOOM (requires 3MB available) were able to work. I know I know, read the source code. I'm getting there. I'm also reading "MS-DOS Beyond 640K" by James Forney. Interesting to note that Id says not to use memory managers or disk caching programs with Doom. Doom and other games must do their own memory management which makes sense for performance.
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