OK, that was pretty smooth. I now have (on the main V6 system) a linker in V6 binary form that outputs MX binary files, so I can do things like: mld sh.o /mnt/lib/lib[ca].a to produce a new shell (which worked fine). (I think to build 'mld' all I had to do was 'cc ld.c', in usr/sys/source on the MX disk.) This whole 'futz with MX by mounting the MX disk under V6' thing works really well. I decided I wasn't up to tackling that, so instead I did all the edits to produce an LSI-11 version of MX. Doesn't boot, though; tries to do a panic, I think. I'm too burned out to keep going, I will continue tomorrow morning (US East Coast time). Once I get it running, before I make it available for download, I need to go back and put conditional assembly flags in mch.s so there's only one source file for both kinds of system; I had originally planned on doing that, but I was in such a 'code attack' mode I forgot all about it. Noel