On Nov 18, 19:30, Stan Barr wrote: they ran. > A starting point is: Well, the main part is the Acorn MOS (Machine Operating System), and to that you can add various filing systems: DFS is the single-density floppy disc non-hierarchical Disc Filing System, ADFS is the double-density floppy/hard disc hierarchical Advanced Disc Filing System, NFS is the Network Filing System, you can guess what ANFS stands for, TFS is the Telesoftware Filing System (for software broadcast as teletext), ... You could also get the UCSD p-System From SofTech/TDi. For the Torch Z-80, there was CPN, a CP/M lookalike. -- Pete Peter Turnbull Network Manager University of York