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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
ScummVM - Game engine recreation of SCUMM made by LucasArts.
DOSBox - DOSBox is a DOS-emulator that uses the SDL-library.
vDos - vDos lets you conveniently run DOS applications by emulating a (spiced up) DOS PC in a window.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
DOSBox-X - DOSBox-X: Free, cross-platform and complete DOS, Windows 3.x and 9x emulation package
Batocera.linux - Batocera.linux is an open-source and completely free retro-gaming distribution that can be copied to a USB stick or an SD card with the aim of turning any computer/nano computer into a gaming console during a game or permanently.