rem: static void scrup(void)
add: scrup(void)
context: static void scrup(void){	int i;	int line_num;	int last_line;	// move the pointer to the top line down one	console.first_line = INC_WITH_WRAP(console.first_line, console.num_lines);//	dprintf("scrup: first_line now %d\n", console.first_line);	line_num = console.first_line;	for(i=0; i<console.rows; i++) {		console.dirty_lines[line_num] = 1;		line_num = INC_WITH_WRAP(line_num, console.num_lines);	}	// clear out the last line	last_line = WRAP(console.first_line + console.rows, console.num_lines);	console.lines[last_line][0] = 0;}