Thanks to all, I have a lot of things to investigate now. Jeff : indeed , I've never been able to reproduce the problem "on demand", but each time I remember crashing, I was doing serial communication or "saving files", so more than likely using TSDOS. So that's one area I'm gonna investigate. If I could reproduce those crashes with a TSDOS from a bootstrap (or anything else than from my REX# ROMs) that would already rule out a problem with REX. I however do remember the last crash, on my M200, was while hitting F2 (save) in TEXT, saving to... RAM. But, I had a serial device connected. But most crashes occured while doing serial - so inside TSDOS for sure. Alex ; that's very interesting too. My M200 is eating a suspiciously high amount of quality batteries for a device I'm using 30 minutes once in a while, and I think I often ear it click for no reason. I'm gonna investigate this as well. I was a bit ashamed to email about my problem but I'm happy I did. Everyone seems to imply TSDOS
is not something to be trusted (to put it mildly :) )
