I have found the source code for DEC-8E-NEAEA-A, the 23-bit EAE version, on David Gesswein's site at <http://www.pdp8online.com/pdp8cgi/os8_html/F1092.PA?act=file;fn=images/jby/putr.tu56;blk=35,98,0;to=auto>. Fortunately, this is the one described in the 1972 edition of DEC's "Introduction to...