It sounds like you're using LPT1 directly (bypassing the Windows print manager, which makes sense here) and filling up the printer's buffer. I know next to nothing about NTVDM, so I don't have a software fix to recommend. You might be able to bypass the problem by using a productivity-focused DOS emulator like vDOS or vDOSPlus. You could also try hardware fixes: hunting down an old parallel printer buffer or... Source: almost 2 years ago
Do you know an article comparing vDosPlus to other products?
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