Disable multiple undo

In ver. 3.3.0003, how does one set 'yes' for "Disable multiple undo" and 'no' for "Enable Undo Groups" without having to go through the menus to do so with each drawing?This used to work in Icad.lsp, but doesn't any more: (command ".undo" "_a" "_off" ".undo" "_c" "_o")Thank you,VM