-----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Bob Armstrong Sent: Monday, July 02, 2012 12:10 To: hecnet at Update.UU.SE Subject: RE: [HECnet] This is probably been asked already but.... The PRO was for later VAXen. 8800-range, I think. That must be where I saw it, because I remember a VAX with what was clearly a PRO attached to it. We used to joke that it was the only way DEC could sell the PROs :-) The 86x0 uses a T11, and runs RT-11. Was it like a FALCON/KXT11 board based thing, or some custom T11 board? How (where) did they get RT11 for it? The T11 had a few oddities (e.g. no bus timeout traps) and AFAIK RT11 was never supported on T11 systems. I've heard that there was an unofficial, hacked up, copy of some RT11 release that would work but I never saw a copy. The 86x0 does in fact run a real version of RT-11. The disk sub-system was a RL0x (can't remember if it was 1 or 2). It had its own set of quirks - to say the least! The sources have macros to deal with the T-11 differences. They were in the middle of the changes to RT-11 just as I joined the group. One of the guys spent quite a bit of time in Marlboro, MA trying to get the sub-system to deal with the RL0x.. It was a beast! :-) I've actually got a FALCON board, so it's more than just an academic interest. Bob