Gentle update: I originally said this was the earliest LINC photo, which on review is highly incorrect.
I had conflated some stuff about how Wilkes worked on the original OS (more of a simple assembler, really) on a #LINC emulator she wrote on the TX-2. She spent a lot of time haranguing Wes and the others to pin down behaviours of the hardware so she could get it finished, but they were redesigning regularly due to the tight constraints and new flipchips coming out at #dec.
She worked with all the biomedical researchers they shipped the things to, teaching them how to get software written that worked with their experiments. Apparently that was so exhausting that she took a year off to travel the world, and in 1965 she got back to the US and found LINC had spun off from MIT and was based in St. Louis. She was still in sort of "gap year" mindset and said she'd work on the machine but didn't want to commit to any particular city. So they shipped one of the existing units to her father's home in Baltimore.
The OS she worked on there was LAP 6 (LINC Assembly Program version 6), which was vastly superior to the earlier versions. It had a full-screen text editor that took advantage of the RAM expansion modules that LINC were shipping at the time, and really made the machine more generally useful.
The OS that shipped with the #pdp12 from #dec was called "LAP6DIAL"
