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Thinking of HP: remember SPL/3000?
The system program language for the HP/3000 -- I never saw any assembler
And it was ... Algol ! Clean, powerful.
Wikipedia says it survived the transition from the 3000 to PA-RISC.
Yes, I remember some SPL. OK, very little. TOS? Was that a register that held a pointer to the top of the stack?
I also remember programming HP "smart terminals" with escape sequences. For the more powerful terminals, one could draw polygons with escape sequences and thus produce various charts and other diagrams.
It's going to save me a lot of time, anyway, as I won't see the CD for at least two weeks.
Having now had a browse, I have also found the table of 256 special characters that I used for integers, so I can now backtrack onto all the many constants used in close to a thousand polynomial terms.