To print a character to the lower right corner of the screen without scrolling you must turn off the word wrap function of the ANSI driver (see also ANSI ESC Sequences):
/* code to show how to use the lower right corner of the display */
/* ESC code for ANSI sequences */
ansi.__ESC = "1B"x
/* ANSI sequences to position the cursor in the */
/* upper right corner */
ansi.__Pos0 = ansi.__ESC || "[1;1H"
/* ANSI code to turn word wrap off */
ansi.__WordWrapOff = ansi.__ESC || "[7l"
/* ANSI code to turn word wrap on */
ansi.__WordWrapOn = ansi.__ESC || "[7h"
/* empty line for the menu frame */
Menu.__emptyLine = "║" || copies( " ", 78 ) || "║"
/* separator lines for the menu frame */
Menu.__FrameLine1 = copies( "═", 78 )
Menu.__FrameLine2 = copies( "─", 76 )
/* menu frame */
Menu.__MenuMask = ,
ansi.__Pos0 || , /* position cursor */
ansi.__WordWrapOn || , /* turn word wrap on! */
"╔" || Menu.__FrameLine1 || "╗" || , /* menu frame */
Menu.__emptyLine || ,
Menu.__emptyLine || ,
"║ " || Menu.__FrameLine2 || " ║" || ,
Menu.__emptyLine || ,
"╠" || Menu.__FrameLine1 || "╣" || ,
copies( Menu.__emptyLine, 14 ) || ,
"╠" || Menu.__FrameLine1 || "╣" || ,
Menu.__emptyLine || ,
"║ " || Menu.__FrameLine2 || " ║" || ,
Menu.__emptyLine || ,
ansi.__WordWrapOff || , /* turn word wrap off */
"╚" || Menu.__FrameLine1 || "╝" || , /* last menu line */
ansi.__Pos0 || , /* position cursor */
ansi.__WordWrapOn /* turn word wrap on */
/* clear the screen */
'cls'
/* show the menu frame */
call CharOut , Menu.__MenuMask
/* position the cursor in the middle of the */
/* screen */
call CharOut , ansi.__ESC || "[12;30H"
/* wait for a key from the user */
"@pause"