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Looks like macro-heavy assembly to me. If one is not familiar with macro assemblers, in summary you could write your own language in macro assembler. And some did, which makes for a great debugging session if you're the one that has to fix it long after the original dev left.

This page explains better than I ever will: https://www.tutorialspoint.com/assembly_programming/assembly...

OT: I had a research project many years ago (it feels strange that I can now call it "many") that was to translate a program into C. The original program was written in "FORCE", which was a macro language extension on top of Fortran that we no longer had a compiler for. It was absolutely fascinating.

I imagine the answer is somewhere in here: http://rmf.vc/implementingvisicalc

Great link! The answer is that it's written in a custom 6502 assembler macro language that abstracted over looping, and the macros were an extension of a 6502 assembler that was hosted on Multics.

Yeah, pretty cool to see a photo of that. It was coded in assembler, first for the MOS Technology 6502 microprocessor used in the Apple II.