> On 20 Apr 2016, at 21:44, Ken Cornetet <ken.corne...@kimballelectronics.com> > wrote: > > That “some kind of transfer utility” is exactly what I’m trying to implement. > > In order to transfer files between a guest and host you need some sort of > shared medium. > > In the realm of simh hosted OSes, there are basically 3 forms of > bidirectional io devices: paper tape, mag tape, and disk. Paper tape isn’t > seekable, so it isn’t really suitable. > > That leaves mag tape and disk as the only shared medium that is supported by > the guest OS. > > So the next question is, how do you implement a file transfer utility using > shared tape or disk, and that’s exactly what I’ve proposed. > > There is another option which can be used: modify the guest machine virtual > architecture to implement a new data mechanism, and to the modify guest OS to > support it. This has the advantage that it is more flexible and more > powerful, but has the disadvantage of requiring not so trivial modifications > of the guest emulation and modification to the guest OS. Additionally, since > emulated machines have vastly different architectures, this would be > difficult to generalize and integrate into simh as a whole. > > I eventually plan to do exactly this on the hp2100 emulator by writing custom > microcode (creating new instructions essentially) and writing an RTE driver > so that userland applications can access it . However, the mods I make for > the 2100 emulator will not be anywhere close to being usable on other > architectures. > > That’s the beauty of using the disk file as the shared medium – you modify > simh once, and you get the ability to use that mechanism on every simh OS > that knows how to handle raw disks or seekable tapes. You do have to write a > small LIF interchange utility, but that shouldn’t be too bad.
Fair enough - I’m just saying that maybe an FTP server isn’t the ideal mechanism for accessing the LIF device on the host OS side.. Sampsa
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