On Thursday, October 03, 2013 at 9:39 AM, Johnny Billquist wrote: On 2013-10-03 17:24, Paul_Koning at Dell.com wrote: On Sep 29, 2013, at 9:18 AM, Johnny Billquist <bqt at softjar.se> wrote: On 2013-09-29 14:48, Sampsa Laine wrote: I noticed that the SIMH PDP-11 distribution contains emulation of TC11/TU56 DECtape drives. My questions are: - How hard would these be to port to the VAX SIMH emulation? - Do modern VMS (e.g > 7.0) OSes support DECtapes? I figure it would be a nice way to transfer files between a PDP-11 and VAX system for example.. VMS have never supported DECtape, as far as I know... Not officially. But I know it was done as a "midnight project", by Andy Goldstein if I remember correctly. That supposedly even included overlapped seek support, just as TOPS-10 did. Why am I not surprised he would be involved... You might just turn it on and see if it works "out of the box". I would assume the file structure used is the same as what RSX uses, whatever that is. That would be normal Files-11 in that case. It might be a single directory file; structure, though. Like for floppies. It would be easy enough to add the TC11/TU56 to a simh Unibus VAX system. I think that the hard part would be getting the "Midnight project" device driver which may have been written back then. The driver doesn't seem to be included in VMS: $ mc sysgen SYSGEN> CONF DEVICE> tc11 DEVICE> Exit Device: TC11 Name: DTA CSR: 777340 Vector: 214 Support: no Notice the "Support: no". - Mark