Thanks. My final goal will be to have an advanced MUD-like (realtime, multiplayer, multiplatform etc.) Interactive Fiction, text adventure game engine for all the 8-bit Commodore machines at once (that will be the "Rosetta") one day, but before further working on it, I am still making some smaller projects, like this MemTest, mainly for myself just to better learn and understand or experiment some possible features and the behaviour of all machines.
I had already visited your website sometimes before (beside several other places on the internet for slowly collecting the useful information all over the months and years) and found it helpful. I saw that your operating system would also be a rather ambitious project of this kind, and hope it will be fine finished some day.