Cirrus Logic

Cirrus Logic was a graphics chipset manufacturer for the IBM PC and its compatibles. Founded in 1984 in Silicon Valley, their chipsets became very popular due to their low cost and high degree of compatibility.

The 1987 they entered into a contract with VideoSeven to design and manufacture a VGA chipset to VideoSeven's specifications. This was released as the CL-GD410/420.

During the early 90s, when compared to other Windows graphics accelerator cards from Trident, Oak, and Paradise (Western Digital), the Cirrus Logic usually outperformed them all.

In 1991 the company acquired Crystal Semiconductor, an audio mixer/DSP chip company. In 1992 they bought AcuMOS, a video chipset company who designed and manufactured chipsets called "AVGA1" and "AVGA2". These were rebranded in late 1992 to the CL-GD naming format.

Here are their cards in chronological order:

ISA Cards	VLB, PCI and AGP Cards
ISA Graphics Cards CL-GD410/420 (1987) CL-GD510/520 (1988) CL-GD610/620 (1989) CL-GD5320 (1990) CL-GD5410 (1991) CL-GD5401 (1992) CL-GD5420 and CL-GD5421 (1992) CL-GD5422 (1992) CL-GD5402 (1993) CL-GD5426 (1993) CL-GD5428 (1993) VRAM-VGA / VRAM VGA (1988) VGA 1024i and VGA 1024i Plus (1989) VRAM II (1992) Win.VGA / Win VGA (1992) Win.Pro / Win Pro (1993)	VLB and PCI Graphics Cards CL-GD5424 (1992) CL-GD5425 (1993) CL-GD5426 (1993) CL-GD5428 (1993) CL-GD5429 and CL-GD5430 (1994) CL-GD5434 and CL-GD5436 (1994) CL-GD5440 (1995) CL-GD5446 (1996) AGP Graphics Cards CL-GD5464 (1995) CL-GD5480 (199?)