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At some point earlier than Monitor being renamed to TOPS-10, altmode was used directly, rather than being translated to 033 octal, because in the 1963 version of ASCII, 033 was a "S3" control. So in the early days, programs like TECO dealt directly with 175 altmode and the old 176 escape.
This was the case for TECO on other early systems as well, though I'm not sure what TECO on the PDP-1 used for the console typewrite4 or add-on Flexowriters, as those weren't ASCII at all.
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