keepin' it real

Your post reminded me that it is possible to go beyond 640k on the old IBM pc provided that you used a color monitor and used the 80k that was reserved for the monochrome if you had the board fully populated. One of my old instructors at my local college was doing that back when IBM only allowed their machines to have a limit of only 512k.

IIRC QEMM has that option

Yes QEMM is able to do this with the DOS-UP feature. However using it in "Full" mode reduces compatibility a lot. Best is to stick to "Partial" which is basically the same as Microsoft introduced in MS-DOS 7.

I found out about this while reading the JEMM386 documentation. Never knew about this before, it's so weird seeing anything else than 639/640k there for the first time.
Unfortunately it's completely useless, since including A000-B7FF seems to break like 90% of all programs, and A000-BFFF disables screen output entirely.

Well, A000-AFFF = EGA/VGA, B000-B800 = MDA/Hercules (B000-BFFF when using both Hercules pages), B800-BFFF = CGA (all modes) and EGA/VGA text modes.
768k means A000-BFFF used for normal RAM.
So this is only useful for text mode applications or CGA/Hercules games, which probably don't need that much RAM.