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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 3 years ago
DOSBox - DOSBox is a DOS-emulator that uses the SDL-library.
DOSEMU - DOSEMU stands for DOS Emulation, and allows you to run DOS and many DOS programs, including many...
vDos - vDos lets you conveniently run DOS applications by emulating a (spiced up) DOS PC in a window.
FreeDOS - . creation tool just didn't feel up to the task. So, I created a new utility that may have better results.
DOSBox-X - DOSBox-X: Free, cross-platform and complete DOS, Windows 3.x and 9x emulation package
JsDOSBox - [Development stage] JavaScript PC DOS Emulator