The HP 100/200LX should be able to use .EQN files created on the 95LX. However, Solver on the 95LX can work with a slightly larger .EQN file than Solver on the 100LX can accept. Hence, there is a possibility that a 95LX .EQN file will not work on the 100LX or 200LX. If you discover this problem with a large .EQN file (40K and above), load it on your 95LX and split it up into small .EQN files. Do this by loading the .EQN file, deleting some of the equations and saving the file under a different name. Reload the original .EQN file and repeat this process until the big .EQN file has been divided into smaller ones.
Rich Hall
Editor, HP Palmtop Paper