The current state of simh allows to network a TOPS-10 simulated machine using the KDP/DUP interface. You need a VAX (or a PDP-11) configured as routing node and with a synchronous device enabled. As far as I know, this restricts your choice to a "full" VAX (I use the vax780) and to VMS 4.7 (I think later versions do not support the DMC without additional software). The gory details: http://ancientbits.blogspot.com.es/2014/01/networking-virtual-ks-10.html Enjoy! Jordi Guillaumes i Pons jg at jordi.guillaumes.name HECnet: BITXOV::JGUILLAUMES