public void scroll(int amount) {
if (screen.getScrollTop() == 0 && screen == defaultScreen && amount > 0) {
while (amount > 0) {
int[] line, copy;
history.scroll(1, false, 0);
copy = history.getLine(0);
line = screen.getLine(0);
for (int j = 0; j < line.length; j++) copy[j] = line[j];
screen.scroll(1, true, attributes);
amount--;
}
} else {
screen.scroll(amount, true, attributes);
}
}
public int dataAt(int column, int row) {
int[] line = screen.getLine(row);
return line[column];
}