Make sure you have run
TINST.COM first, selecting an ANSI terminal - if your
TURBO.COM is not configured for the ANSI terminal, the screen layout is totally messed up. I can confirm that Turbo Pascal 3.01 runs fine in the SC126.
And one more thing - I found that the highlight ON/OFF terminal codes were swapped in my installation, so when I quit Turbo Pascal, the terminal was left in a highlighted mode.
In the ANSI terminal I have now set:
START HIGHLIGHTING command: <ESC> [ 0 m (27 91 48 109)
END HIGHLIGHTING command: <ESC> [ 1 m (27 91 49 109)
This seems to work better for me.