resman, thank you for those pics! Very helpful. I have tried everything on my “primary” SLT/286, but just can’t get it to work reliably. It works fine on my other (newer) SLT/286 though, which has a newer revision system board and BIOS. When I launch Windows/286 (the main reason I want expanded memory) on the older one, it will load up and see the expanded memory, but the hard-lock the machine when you open any programs. I ran all Compaq Diags and it checks out fine, so I’m thinking it’s an incompatibility with that newer version of CEMMP and the older BIOS. Just a theory. Going to pop the ROMs from the newer SLT into the older one and see if that changes anything. I really don’t think anything is broken because it works great when the extra memory is used as extended. Been using this SLT as one of my primary DOS machines for years with no issue. Worst case I’ll just give up putting EMS on this machine. Windows will just about do everything I need with the base 640 anyways, but having 1MB of EMS would be very handy.