Low resource/DOS and "study sim" I fear are pretty much mutually exclusive. To get a study sim (system depth you want, I assume, or precise IFR instrumentation) you need a certain amount of computer power.
For DOS-level system specs, I see pitchblack. You could try to get an old copy of FS95, FS98, FS2000, FS2002. Basic IFR training you can do with all of these.
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