The Weitek 91460, released in 1992, was the "brains" behind some of the innovative graphics abilities displayed by the Commodore Amiga. Assisted with 2 Mbytes of memory, Ameristar Technologies featured the 91460 chip on their Model 1600GX graphics adapter card.

View a medium magnification image of the Weitek 91460 processor.

View a high magnification image of the Weitek 91460 processor.

Ameristar's 1600GX graphics adapter card featured the Zorro III bus and met Amiga's then-brand-new RTG graphics standard. An acronym for ReTargetable Graphics, RTG was an Amiga-specific true color standard that allowed processors to direct output from any graphics chipset to a monitor, a big step for computers at the time. The card had programmable resolutions from 640 x 480 pixels up to 1600 x 1280 pixels for non-interlaced video based on 256 colors from a 24-bit palette. Connectors included both BNC (British Naval Connector or Bayonet Nut Connector) and VGA (video graphics array) standards.

The Weitek 91460, an 8-bit chip, featured a 180-MHz dot clock, 100 million pixels, 2 Mbytes random-access memory, and 16 ZIP screen modes. Weitek went out of business in 1997, but was absorbed into the Brooktree Division of Rockwell Semiconductor, which survives as an independent spin-off, Conexant Systems. Although no longer manufactured, Commodore Amigas still capture some retro aficionados' hearts and minds.