I have a SIDE2 which boots correctly into SpartaDOS-X now on multiple 800XLs will not load completely on a 130XE I have.
SD-X starts to load saying "Ultimate Clock Installed" then just hangs indefinitely.
I've tried it with and without a CF card installed and various power off/reset button combinations.
The 130XE appears to be fully functional -- I can play games on it without a problem.. The built in RAM test succeeds (let it run for several passes continuously)..