checkOverlay(int vector) Checks to see if 8086 interrupt vector ``vector'' has been initialized.
vector is the interrupt vector number. The default value is 0x61.
scrollUp(int row1, int col1, int row2, int col2, int nLines, int attr) Calls the BIOS scroll up function. row1,col1 is the upper left corner of the scroll region row2,col2 is the lower right corner of the scroll region nLines is the number of lines to scroll attr is the character attribute of the blanks that are put into the empty character positions.
clearScreen() Uses ``scrollUp'' to clear the screen.
setCPos(int row, int col) Moves the cursor to the specified row and column. row,col is the position to move the cursor to.