Well, since we are talking about the PDP series, besides the BASIC language (and OBASIC), I used to program in a language called FOCAL (FOrmula CALculator). No lower case. The OS on our PDP-8/M was ETOS, and we booted from the front panel. Core memory, DEC Tape. Paper Tape. 150 baud acoustic modems. Lear-Siegler ADM3A consoles. Good times.
Oh, and the PDP8M was a 12 bit central processor, and Octal was used in the assembly language (PAL) The text editor was TECO.