x = 204, y = 104, rule = B0/S3
bo$b2o$3o$5o$b6o$5b4o$7b4o$9b4o$11b4o$13b4o$15b4o$17b4o$19b4o$21b4o$
23b4o$25b4o$27b4o$29b4o$31b4o$33b4o$35b4o$37b4o$39b4o$41b4o$43b4o$45b
4o$47b4o$49b4o$51b4o$53b4o$55b4o$57b4o$59b4o$61b4o$63b4o$65b4o$67b4o$
69b4o$71b4o$73b4o$75b4o$77b4o$79b4o$81b4o$83b4o$85b4o$87b4o$89b4o$91b
4o$93b4o$95b4o$97b4o$99b4o$101b4o$103b4o$105b4o$107b4o$109b4o$111b4o$
113b4o$115b4o$117b4o$119b4o$121b4o$123b4o$125b4o$127b4o$129b4o$131b4o$
133b4o$135b4o$137b4o$139b4o$141b4o$143b4o$145b4o$147b4o$149b4o$151b4o$
153b4o$155b4o$157b4o$159b4o$161b4o$163b4o$165b4o$167b4o$169b4o$171b4o$
173b4o$175b4o$177b4o$179b4o$181b4o$183b4o$185b4o$187b4o$189b4o$191b4o$
193b4o$195b4o$197b4o$199b4o$201b3o!
It has 100 "registers". An MB with 25 registers has a period of approximately 89,000. I wonder if MBs can be emulated with a 1-D cellular automaton? It would have 6 cellstates: beginning, end, "empty", "dot", "L", and "filled".