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```#!/usr/bin/env python
# -*- coding: utf8 -*-
__version__ = '\$Id: binclock_bcd_curses.py 780 2010-10-19 10:33:34Z mn \$'

# binary clock, bcd version
# author: Michal Niklas

import sys
import time
import curses

def bin_old(n):
"""bin() that works with Python 2.4"""
if n < 1:
return '0'
result = []
while n:
if n % 2:
result.append('1')
else:
result.append('0')
n = n // 2
result.reverse()
return ''.join(result)

def bcd_digit(sn):
"""converts decimal digit char to 4 char binary 0 and 1 representation"""
n = int(sn)
try:
bin_nr = bin(n)[2:]
except NameError:
bin_nr = bin_old(n)
return ('0000' + bin_nr)[-4:]

"""add n binary digits to digits"""
nn = "%02d" % (n)
digits.append(bcd_digit(nn[0]))
digits.append(bcd_digit(nn[1]))

def get_stars(digits):
"""changes digits to vertical picture of clock with stars and dots"""
digits_arr = []
for j in range(len(digits[0]) - 1, -1, -1):
digits2 = []
for i in range(len(digits)):
digits2.append(digits[i][j])
digits_arr.append(''.join(digits2))
digits_arr.reverse()
stars = "\n".join(digits_arr)
stars = stars.replace('0', '.')
stars = stars.replace('1', '*')
return stars

def main():
try:
try:
window = curses.initscr()
while 1:
digits = []
window.clear()
tm = time.localtime()
stars = get_stars(digits)
line_nr = 0
for line in stars.split('\n'):
line_nr += 1
window.refresh()
time.sleep(0.5)
except KeyboardInterrupt:
pass
finally:
# reset terminal
curses.nocbreak()
curses.echo()
curses.endwin()

if '--version' in sys.argv:
print(__version__)
elif __name__ == '__main__':
main()
```