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I have an old program designed for DOS running on my WinXP PC under NTVDM. Recently it began showing some strange behaviour and I decided to investigate the problem.

However, none of the search results has documentation on NTVDM itself, apart from brief explanation of what it is, even microsoft.com.

Right now I want to know what command prompt switches exist for it (my program runs with -f -i5) and how to use them.

I've tried running ntvdm from command line with switches like -?, -h or -help, but no output is given.

So, the question is: 1) What command prompt switches exist for ntvdm.exe and what they mean? 2) What -f -i5 switch does in particular?

Edit: added OS

Vladimir Tsuverkalov
  • 146

1 Answers1

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According to http://support.microsoft.com/kb/102986, the only available switches are -a -f -m -w. The definition is supplied.

No mention of -i switch, though.

I'll try to find more info on this subject, as legacy DOS software still in use is not that rare find

According to http://dis.4chan.org/read/prog/1238681773 there is indeed undocumented -i switch in use.

Vladimir Tsuverkalov
  • 146