After a lot of searching I've come to the conclusion that there is no Conways Life program for the Psion 5. Years ago I wrote one for my Psion 3. It worked, and it had some nice features (like a "radar" screen) but it was fairly slow. I'd quite like to pick it up again for my 5mx. This guy - Hensel - has done a lot of thinking about writing a fast Life algorith. What's more, he's made it public! For blobby universes, one should probably consider dividing the universe up into blocks approximately the size of the blobs. For Life, 4x4 to 8x8 seem reasonable. I chose the upper bound, 8x8, for reasons of convenience: There happen to be 8 bits in a byte. I strongly considered 4x4, but it didn't work out as nice....