What is it ?

I have a short 8-bit card with a strange mouse socket. It could be a Zenith card as I found it in an old Zenith PC case piled up inside with other cards which obviously didn't belong to the Zenith. It has a DE9 monitor connection with a mono/color switch below it and a port labelled "mouse" below that. It is a DIN with 9 staggered holes but smaller than your standard k-b socket and larger than a PS/2 or Mac one. Internally it has 2 game and one light-pen connectors. It's most significant chip is a 100pin surface mounted 6612. The only removable chip is labelled AM2764ADC, and 838AE9G. Most of the other chips are logoed GS. There is a # written with marker pen S88101035. Did Zenith have a proprietory mouse at some point or is this another beast entirely. I notice that most of the GS low-powered Shotsky chips are labelled some multiple of H eg: H10, H18, H38 etc. which makes me think Zenith/Heath.