> From: Johnny Billquist <b...@softjar.se> > Date: Sun, 23 Oct 2016 03:11:05 +0200
> In fact, I would probably suggest Ray start with just writing some code > to do some simple things without looking at existing code. The first > thing needed would be to just have something that can load programs from > a device, and run them. This will require some simple device driver, > some simple file system, and a simple command line interpreter. ^^^^^^^^^^^^^^^^^^ That's not even needed. Beyond a 44 character file id in the VTOC on a disk, none of the IBM batch operating systems for the System/360 has what we would call a file system. OS/360 requires the programmer to know how much space a file might occupy in its lifetime and allocate that (including overflow areas); DOS/360 requires the programmer to do all of that, *AND IN ADDITION* to define the exact location of the file on disk. I don't think anyone would argue that those operating systems were unsuccessful in the marketplace. Just sayin'. Rich _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh