The closest thing I know of is a Forth implementation on RSTS (V10.1, unsupported). I created that one, starting from the original which I think was FIG-Forth (Forth Interest Group), either standalone or RT-11 based. But I may be confused; it may be that the FIG implementation was only a source of features. But I do have some memory of a version that loaded from floppy, with application source code simply stored sector by sector and referenced by sector number (no file system). paul On Aug 18, 2010, at 7:02 PM, G ran hling wrote: Hi, Some years ago, I read some Internet writing about a SOL-11 (Small Operating Language), a Forth environment to boot and run a PDP-11. It was written by a mr. Nils Holm in Germany. It was by then available at:http://www.holm-und-jeschag.de/nils/comp.html I cant find any copy of this around anywhere these days, and obviously I didn't download it myself either, guess there was just no space left on any HD in those days... There was also a need for some assembler of Mr. Holms selection to compile this... Does anyone have a copy archived of this little part of software for the -11? Best regards, G ran