Q: Is the 2MB model worth the extra money over the 1MB Model? 
A: The only difference is the extra Megabyte of internal "disk"
storage on the C: drive.  It may be cheaper to buy the 1MB model and
invest the difference in a bigger PCMCIA flash or SRAM card.  But if
you want to keep the PCMCIA slot open for a PCMCIA modem or other
device, you're stuck with internal storage only, and the extra
megabyte may be	worth the money.

Q: Does the 2MB RAM HP-100/200LX have more system memory?
A: No, both models HP-100/200LX are MS-DOS machines which are
inherently limited to only 640KB of system RAM.  But an EMS (not XMS
or himem) driver has been written; see emm040e.lhz or emm100.exe
on eddie.