SS50 to Exorbus adapter found

I was going through some boxes of parts for my SWTPC 6800 collection and I found an unpopulated PCB with SWTPC logo on it and date 1978 which appears to be an SS50 to Motorola Exorbus adapter. It has SS50 connectors on the bottom edge and the 43/86-pin Exorbus connector footprint on the top edge. Looks like locations for two DIPs, one 20-pin and one 8-pin, a voltage regulator and a few passives. The board is 8" wide by 2" high. I have no idea where this came from or why I have it. Does anyone know what it might be for? ie, does it adapt an Exorbus memory or peripheral to SS50 bus or does it adapt an Exorbus CPU to SS50?? I can send photos of the board to anyone that is interested. It appears to be an authentic SWTPC design/product rather than someone's homebrew project or a third party product. So, I am interested in learning more about it. Chris -- Chris Elmquist