The Namco NB-1 is a 32-bit arcade system board which was first used by Namco in 1993; NB-2 has a different memory map, more complex sprite and tile banking, and two additional ROZ layers over the NB-1. Great Sluggers: New World Stadium was the first game to use this board - and the following year, Nebulas Ray, Great Sluggers '94, J-League Soccer V-Shoot, Point Blank (original name Gun Bullet), The Outfoxies and Mach Breakers: Numan Athletics 2 were released on it. In 1995, the eighth title for Namco's long-running World Stadium series was released, Super World Stadium '95 (which borrowed heavily from that original Great Sluggers); in the two following years, it was followed up by Super World Stadium '96 and Super World Stadium '97, the second of which was the last game to use it.
Namco NB-1/NB-2 specificationsEdit
- Main CPU: Motorola 68EC020 32-bit processor @ 12.5 MHz (for the NB-1 games), 24.192 MHz (for the NB-2 games)
- Secondary CPUs: Namco C329 with C137
- Custom graphics chips: Namco C123, C145, C156 and C116 (for the graphic effects) with Namco C355, C187 and C347 (for the motion objects)
- Sound CPU: Namco C351 (utilized for the NB-1 games), Namco C75 (Motorola M37702-based 16-bit) @ 16.128 MHz (utilized for the NB-2 games)
- PCM sound chip: C352 @ 16.384 MHz that supports 8-bit linear and 8-bit muLaw PCM with four-channel output
- Control chip: Namco C160
- Board composition: two boards (NB-1) or single board (NB-2); an additional "gun" interface board was also utilized for Point Blank.