Telnet access to classic mainframe/timesharing systems

From: Michael Kerpan Sent: Monday, June 29, 2009 9:51 AM

I'd be interested to know what's out there vis a vis classic systems that are on the Internet offering public access. Currently, I know of twenex.org (emulated KL-10B DECSYSTEM-20 with Panda TOPS-20), pdpplanet.com (a TOAD-1 with TOPS-20, a DECSYSTEM-10 2065 and a VAX 780) and cray-cyber.org (an emulated CDC Cyber plus a rotating selection of historic super computers on weekends), but is there anything else? Is anybody running classic versions of UNIX (UCB-era BSD, AT&T-era System III/V, V6/V7, etc) Is anybody running a public IBM system? What about various lesser-known systems? Given that most people used these systems through remote terminals to begin with, a public access system would seem to be an ideal way to experience them, but how many of them are available in such a way?