Dead New-in-Box 600XL?

[flashjazzcat]

if you leave the /CE in place, will this allow a 16k rom to be used instead of BASIC? or didnt you look into that deep?

No - I'd never really thought of it along those lines but it's an interesting notion. The idea was to simply emulate the functionality of the OS ROM socket in the BASIC socket, so that upgrade boards normally housed in the former could be housed in the latter. I guess you could go the whole hog and put BASIC in the OS ROM socket with a few more modifications, but as I said before, losing BASIC isn't a problem for me.