Looks like it may be a combo Monochrome /CGA/EGA? video card.
DB9 connector was standard on many early monitors and a simple RCA phono jack for monochrome video.The switch to choose which is active. Or the phono jack might provide composite color video. Looking at the parts,seem to be threes of some ,there is one crystal of unknown frequency.Mention of PC and floppy in the questions
