A user reported that when using Turbo Pascal 3 on his RC2014, scrolling within the source code editor wasn't working.
My way of investigating issues with escape codes is to load up a modified version of PicoTerm which prints every character as a number. I also had the RC2014 connected to a terminal on my Mac, so I could still use TP3.
These are not listed on the Wikipedia ANSI escape code page, which has been my main reference. PicoTerm didn't support them before today. (And neither did PiGFX as far as I can see.) But they do work within minicom and Teraterm, so it seems that they're reasonably 'standard'.
It appears that these codes mean 'insert a line at the cursor position, scrolling everything down' and 'delete a line at the cursor position, scrolling everything up'. I have assumed that the number is the number of lines to scroll, although I can't be sure about this until I find some documentation.
Picoterm is built with scrolling in mind - each line of text is a structure, and the display buffer is an array of pointers to these structures, so scrolling is no more than switching 30 pointers around, and clearing a line.
So adding support for these escape codes was straightforward. Each is a variation on the scroll that is already used when the cursor reaches the bottom of the screen.
Here is a quick demo, first showing another new feature of the textmode (mono) version of PicoTerm - the ability to switch colour on startup, according to button A, B or C being held on power-up. White, Green or Amber.
Then a quick demo of the scrolling up and down within Turbo Pascal 3's editor.
More information about PicoTerm generally, and downloads, are here.