PDP-11/45 Operating system compendium

This video shows the front panel of my pdp-11/45 as it boots thirteen different operating systems: XXDP, DOS-11, RT-11, FIG FORTH, RUST/SJ, RUST/XM, RSX-11M, RSTS/E, MIT SITS, DSM-11, AT&T Unix v6, 2.9BSD, and ULTRIX-11. The audio recordings were collected using a "junk box" electrophone, for which plans can be found here: [https://github.com/kb1dds/electrophone]