Memory Addresses of the SPEA SHOWTIME PLUS It is necessary to make sure that all I/O and memory addresses reserved for the graphics board are not used by other hardware devices. The SPEA SHOWTIME PLUS uses the following addresses: I/O addresses: Standard VGA I/O 3B0-3DF Extended Register 217A-217B Memory addresses: Video RAM A000-BFFF Zoran, Viper chips BE00-BEFF Graphics Engine BFF0-BFFF Video ROM C000-C7FF