Jerome Fine replies:
 
 Mapped - Device drivers are ddX.SYS
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RT11XM  -  (eXtended Memory) Allows both a Foreground and a Background
           job more recent versions also allow system jobs 
Don't forget RT11ZM (extended memory monitor with separate I&D support)
and RT11ZB (Single-job version of extended memory monitor with separate
I&D support)
                                        Megan Gentry
                                        Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL,ST| email: mbg at 
world.std.com         |
| Member of Technical Staff      |        megan at 
savaje.com          |
| SavaJe Technologies, Inc.      |             (s/ at /@/)             |
| 100 Apollo Drive               | URL:     
http://world.std.com/~mbg/ |
| Chelmsford, MA 01824           | "pdp-11 programmer - some assembler |
| (978) 256 6521   (DEC '77-'98) |  required." - mbg            KB1FCA |
+--------------------------------+-------------------------------------+