Really nice work! From skimming it, it seems really well written. I'm looking forward to reading through the whole thing. I like how you contextualized how the different versions of the game were written and included primary source documents. The visual diagrams are also neat and help your explanations. If you're interested in even more Tempest source code, the code for the MS-DOS version of Tempest 2000 is publicly available here. https://archive.org/details/tempest-2000-dos-source-code I haven't tried building it myself, but from skimming through the files it seems to be intended for Borland Turbo Assembler in ideal mode.