I think this is a Sigma Designs EGA card for an ISA Bus PC or compatible.
Vintage Sigma Designs Maximizer Rev. 3.0 IBM PC/XT Memory Expansion Board - QTY
Sigma Designs Laserview Display Adapter Vintage ISA Card 1987 Excellent AS-IS
Sigma Designs REALmagic B121-E5 EM8300 DVD/MPEG-2 Hardware Decoder Card
Sigma Designs PageView SE Video Card for Apple Macintosh SE PVA-SE-PV88
IBM EGA Card Enhanced Graphics Card 1501529 - 100% Working - Original Authentic
EGA Card
