Via SEGAKatana.com

The NEC ARC1A PowerVR PWH-6032 prototype PCI board (also known as the Set 2.1 Dreamcast Development Kit) is one of the oldest prototype Dreamcast development hardware.
This PCI board can be connected to a computer running the Microsoft Windows 95 operating system and can be programmed with Microsoft Visual Studio 5.0.
It also has a VGA and video composite output ports to view demos on a television set or a computer monitor.



The Dreamcast development unit after the NEC ARC1A was the early Set 4 Katana Development box, still in prototype stages, followed by the Set 5, which includes the HKT-01 Sega Dreamcast/Katana Development Box.



The NEC ARC1A PowerVR PWH-6032 prototype PCI board can only be used with the Katana Development Software - Release 2.
Here are videos of four Ninja demos for the NEC ARC1A:

Spinning Compact Disc:
http://www.youtube.com/watch?v=8Ot_QZ9VFE8

Drive 2:
http://www.youtube.com/watch?v=CUhIH-kDLRI

Fishman:
http://www.youtube.com/watch?v=L3Mdk4m5vMg

Scud Race:
http://www.youtube.com/watch?v=mkPCzDn2j1o