[Simh] VAX PSI

[John Welsh]

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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