Oops! I'm sorry, I was mistaken! I was thinking of this AVID PCI add-on card that plugged into certain Apple AV / S-Video cards. 😅
Avid Media Composer Cinema Card (P/N: 630-1922)
https://www.ebay.com.sg/itm/225678484528
Sorry for the delay!
Here is a copy of the STB model 1 hard drive image I was given by slorp. I was not successful in getting it to work (and produce video output) on an STB model 3, even with the additional extensions floating around. However, it is likely more complicated than software, based...
I've dumped and uploaded my Lapis ProColorServer 8•16 II ROM to the Macintosh Garden's page for the driver (here). My card is from a Mac SE/30 and my ROM was on a standard AM27C256 rectangular chip. Hopefully this is helpful! :)