Does the 2MB (4MB, 6MB, 8MB, 32MB, 64MB) HP200LX have more system memory?
No, all models of the HP200LX are MS-DOS machines which are inherently limited to only 640KB of system RAM. But several EMS (not XMS or high memory) drivers have been written; EMM200 is freeware and takes a lot of work to configure for anything other than a 1MB or 2MB 200LX, while Times2 Tech has a better EMM driver called TREMM that works with all the memory upgrades.