Hi Chuck I was thinking you had information on one of the controller boards based on the 8X300 with the WD11xx parts. I've already gotten enough information on both the WD11xx and the 8X300 to create a simple disassembler. I also needed some hardware specific inputs because the board I'm looking at does specific hardware fuctions based on the address that the 8X300 is executing ( similar to many bit slice designs ). This required a custom disassembler.