"Zane H. Healy" <healyzh(a)aracnet.com> wrote: The 11/73 is the KDJ11-A, based on the DCJ11 chip, which has a processor status word at 17777776. It also just so happens that (at least for all the DEC pdp-11s) a machine with memory management also has a processor status word. Not that I know of. The TSX versions of the drivers are the RT-11 versions rebuilt to use PAR6 instead of PAR1 for access to user buffers, et al. Same documented restrictions of PAR1 use in the RT-11 doc set would then apply to PAR6 when using the drivers under TSX... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+