GPU companies (the period they made gpus)

DEC		19xx-1998
HP 		19xx-2000+ (possibly until present)
IBM		19xx-2002+ (possibly until present)
E&S		1968-2006 
Intergraph	1969-2000
Apple		1976-present (some break)
Motorola	1977-1994+ (???)
TI		1979-1988+
Matrox		1979-2014
Hitachi		1981-1986
SGI		1981-2009
Intel		1983-present
Number Nine	1983-2000
Tseng Labs	1983-1997
Cirrus Logic	1984-1998
Video 7 	1985-1991
C&T		1985-1999
Imagination	1985-present
NCR		1986-1993
Paradise/WD	1986-1996
Gemini		1987-1990
Genoa Systems	1987-1991
Trident		1987-2003
Oak Technology	1988-1997
Realtek		1988-1997
Compaq		1989-1991
Sun		1989-2002(+?) 
S3 Graphics	1989-2010
Macronix	1989-1998
Winbond		1989-1996+
Tamarack	198x-1991+
UMC		198x-1993
Sigma Designs	198x-1996
Acer		198x-1998 (roughly)
Fujitsu		198x-1998
AMD		1991-present (really starting in 2006)
HMC		1991-1994
Avance Logic	1991-1995
Weitek		<1991-1996
Bitboys		1991-2006
IIT		1992-1994
Weitek		1992-1996(?)
Rendition	1993-1998
ARK Logic	1993-1999
S-MOS/Stellar	1994-1999
Nvidia		1993-present
Alliance	1994-1997
iGS		1994-1999
3dfx		1994-2000
3dlabs		1994-2006
Silicon Motion	1995-200?
SiS		1995-2007
Dynamic Pictures1996-1997
NeoMagic	1996-2000
GigaPixel	1997-2000
Philips		1997-199x
Tatung		199x-199x
ASPEED		2004-present
Jingjia		2006-present