NDS developer Patrick Aalto has released the beta v0.25 for the DS2x86. See below for the release notes.

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"DS2x86 v0.25 Beta Release Notes
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This version has the following fixes and improvements:
- Fixed a copy-paste bug in REP MOVSW string opcode (fixes Heretic, Hexen, etc)
- Implemented INT10 calls AX=1008, AH=12/BL=34, AH=F1/DX=0020, AH=F1/DX=0028
- Implemented missing 66-prefix variations for LFS and LGS opcodes (NORM)
- Implemented missing RCL/RCR opcodes using 32-bit registers (SWS)
- Implemented read/write to/from CPU debug registers (RAYMAN)
- Enabled directory access using the 8.3 alias of a long directory name
- Ignore writes to I/O ports 0x140..0x14F (DESCENTR)
- Some other minor fixes and enhancements."

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Source

Official Site