Hood,
My recollection of AhHa is that you are correct. And as I remember, AhHa OS was written in a version of visual basic and was delivered as serial data. The 15 pin serial port was the only interface with the machine from the operating system and in that light; are the driver boards going to work? A currently available breakout board would bring the system up to the standards of control offered by the Mach OS but the driver system may not be capable....