You could try the Text Mode utility from Jason Hood, available here:
http://adoxa.3eeweb.com/
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What about trying a loadable font? Been a long time since I've used them on
DOS, but IIRC they loaded a font into video mode and basically ran in that
video mode.
Also IIRC, doesn't 4DOS provide the ability to flip into a higher video
mode - I think that's what you're describing. Worth trying.
JH