[Simh] VAX PSI

[Peter Allan]

Mention of VAX-2780-3780PE piques my interest. I have a long term desire to
be able to connect a simulated VAX (or even better, a PDP-11) to a
simulated IBM mainframe (using Hercules) and use the VAX/PDP11 as a remote
job entry system for the IBM. Has anyone tried to do this?

Cheers

Peter Allan

On Thu, 19 Mar 2020 at 23:51, John Welsh <johnwelsh at optusnet.com.au> wrote:

> Hi Dave,
> I have been involved in a project using VAX-2780-3780PE and have been able
> to connect two VAX’s together using a Black Box Synchronous Modem
> Eliminator ( SME ).
> Product code: ME204A-F.
> No VAX PSI involved.
> Needed Decnet Plus and Wan drivers.
>
> Was able to test using a utility that comes with the Protocol Emulator -
> XJTEST which can use either VAX as a loopback.
> In my case it was a DSV11 to a DSW42 using the SME and the V.24 cables
> that come with the adapters.
> There is also another utility called REMOTE that can transfer simple files
> from VAX to VAX.
> I don’t think there is a driver for SIMH that can emulate a sync device. (
> yet ).
>
> Regards,
> John Welsh.
>
> Sent from my  iPhone
>
> > On 20 Mar 2020, at 03:38, dave porter <dave_list_addr at verizon.net>
> wrote:
> >
> > I know almost nothing about VAX PSI, but I have a vague idea
> > that even though X.25 is asymmetric and intended for DTE to DCE
> communication (i.e., your computer to the phone company's premises), it may
> be possible to coerce it
> > into talking from one VAX to another (via null modem
> > cable connecting two devices such as DUP-11s).
> >
> > I worked on RSX-11M PSI and that's how we tested in
> > the lab.  I can no longer remember how that was done.
> > Undocumented option somewhere, no doubt.
> >
> >
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