"DR-DOS released DR-DOS 8.1 in the beginning of this month. But instead of an upgrade of the previous DR-DOS 8.0, it's something completely different. The kernel is a badly patched copy of the Enhanced DR-DOS kernel old version 7.01.06 without any credit to its author Udo Kuhnt. The other programs and drivers included are old versions of some popular open source, freeware and shareware products without licenses, documentation or even credit to their authors. This means that DR-DOS 8.1 is just a bunch of old tools plus a compilation of others' works, obviously sold without permission and in violation of their license terms."
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Member since:2005-07-05
640k limit?
*runs mem*
I've got 740k (NOT a typo) of free conventional memory in single-tasking text-only mode, and 605k free with the preemptive multitasker loaded and graphics enabled on the DR-DOS machine next to me, and that's after all the drivers and TSRs, including the packet driver and multiplexer for my network card, are loaded. Not only that, but I've never run out of memory, since almost everything I run on the box uses DPMI, which opens up the whole 4GB address space.
Member since:2005-10-02
Exactly 
DR-DOS is not even remotely based on MS-DOS. It's compatible, but mostly because MS-DOS was and is an illegal hack of CP/M-80 ported to x86.
DR-DOS is the continuation of CP/M-86 modified to be compatible with MS-DOS.
One of the differences between CP/M-86 and MS-DOS was the 640 KB memory limit in MS-DOS. This one didn't exist in CP/M-86 and therefore does not exist in DR-DOS 
Member since:
2005-10-02
And it's based on CP/M-86
It doesn't really suffer from that 640 KB limit.