Just this past year, I have been working on refurbishing my Simmons SDS1000 brain that I got with my kit in 2006. I know the CPU is an Intel 8051 but I am not sure if any 8051 will work, or if it has to be the one marked SDS1000 for it to work with the rest of the unit. Does anyone know where I can get the service manual with schematics? I looked all over the net for them but couldn't find any.