For running in a DOS VDM under OS/2 we need 2 things.
1. The computer must have a sufficient BIOS to run Lotus 123 DOS
Clearly the X250 running CSM in legacy mode does not meet this requirement
So far the most recent laptop that can run it is T43 (April 2005)
2. The following DOS Settings are used:
DOS_FILES
64
DOS_VERSION
123.EXE,3,40,255
123DOS.EXE,3,00,255
LOTUS.EXE,3,40,255
DPMI_DOS_API
ENABLED
DPMI_MEMORY_LIMIT
16
EMS_FRAME_LOCATION
C0000
EMS_MEMORY_LIMIT
8192
MEM_EXCLUDE_REGIONS
D0000-DFFFF
MEM_INCLUDE_REGIONS
C0000-CFFFF