Stephen, You did not ask how to create a larger file or if you want to know how to format a DG disk for the OS like RDOS. You also did not say what system you are using to run simh. The reality is that I would not think that simh would care, as traditional C semantics on the 'create' system call will make the entry for the disk in the file system, but until writes are performed, the size is not determined. The seek system call allows you to seek beyond the end of the file and extended the size of the file as needed. I say this because simh, which is a C program, should behave that way and thus not care.
If however, you think this is a problem, with any UNIX flavor (or if you are using Win-10, WSL includes the standard UNIX utilities), if you type: dd if=/dev/zero of=disk0.6103 bs=1M count=25 This will create a 25M file and zero fill it (according to the http://simh.trailing-edge.com/nova.html the DG 6103 is a 25M file, you could also make it larger or small as appropriate, but I think you get the idea). How to create a DG file system on it, will take booting the simh, Nova emulator and running the DG utilities on that file after it was created. ᐧ On Mon, May 20, 2019 at 5:26 AM Stephen Merrony <merr...@gmail.com> wrote: > Can someone remind me how to create a blank disk image file for use with > SimH? > > > > I tried the following… > > > > set DKP0 6103 > > attach -n DKP0 disk0.6103 > > > > …but it just creates a zero-length file which is no use. > > > > Thanks, > > > > Steve > > > > *---* > > *Steve MERRONY* > > > _______________________________________________ > Simh mailing list > Simh@trailing-edge.com > http://mailman.trailing-edge.com/mailman/listinfo/simh
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