SD: Under RT-11

Does anyone else who is reading this still use the DEC SD: (Symbolic Debugger) under RT-11? I have been spending some time, of late, becoming more familiar with this software and I have noticed a few areas which could use some improvements. This post is in respect of version Y01.16 which runs under the most recent versions of RT-11, and in particular the SDHX.SYS variant which runs under a Mapped RT-11 Monitor. The two major aspects that could use some improvement are to reduce the Low Memory required from 1124 words to perhaps half that requirement. The second is a lack of a history capability. Doing so will certainly require the use of additional Extended Memory beyond the 8192 bytes already in use and that is probably the major obstacle to overcome. One other aspect that might possibly be changed is the fact that the SDHX.SYS variant freezes RT-11 when the user is at the DBG> prompt. While that is a major problem, I don't know if there is a solution which would allow the user to unfreeze the system and allow other jobs to execute. As for the Symbolic Debugger capabilities that are available under RSX-11, in particular with respect to programs with overlays which the DEC Symbolic Debugger under RSX-11 is reported to posses - even before the overlay is loaded, that may also be possible if there is sufficient need under RT-11. I would appreciate a response from anyone who still uses SD: under RT-11, especially under a Mapped RT-11 Monitor and most definitely from anyone who uses the version Y01.16 which DEC limits to certain versions of RT-11, but which is capable of supporting debugging under versions of RT-11 at least as far back as V05.03 of RT-11. Jerome Fine