Looking for early versions of MicroVMS & VWS

On Tue, Mar 24, 2009 at 3:30 PM, Paul Koning <Paul_Koning at dell.com> wrote: I wouldn't be so certain - my experience is that the the way the TK50 works, you can store *up to* 95MB per tape *if* you can keep the silos full. A MicroVAX-I is a slooooow beasty. There's no problem with the Qbus itself, but my concern would be that system overhead, interrupt latency, RQDX performance, etc., could be bad enough that the OS just couldn't fill tape buffers fast enough. Of course, trying to back up 30 MB onto a 95MB tape doesn't require perfect performance. Thinking about it, perhaps it's worth the effort to use Standalone Backup - that should minimize any OS effects on backup speeds. Once the tape is written, ISTR the TK50 will back the tape up as necessary to extract what's on it. It's writing that you _must_ optimize. Comments from others with TK50 experience welcome, but that's how I remember it from c. 1986. -ethan