See here for unformatted version.
(defun c-key-settings ()
(define-key c-mode-base-map "\C-m" 'newline-and-indent))
(add-hook 'c-mode-common-hook 'c-key-settings)
(defun perl-key-settings ()
(interactive)
(define-key cperl-mode-map "\C-m" 'newline-and-indent))
(defun fortran-key-settings ()
(interactive)
(define-key fortran-mode-map "\C-m" 'newline-and-indent)
(define-key fortran-mode-map "\M-\C-m" 'fortran-split-line))
(defun f90-key-settings ()
(interactive)
(define-key f90-mode-map "\C-m" 'newline-and-indent)
(define-key f90-mode-map "\M-\C-m" 'f90-break-line))
1
(defun emacs-lisp-key-settings ()
(interactive)
(define-key emacs-lisp-mode-map "\C-m" 'newline-and-indent))
(add-hook 'emacs-lisp-mode-hook 'emacs-lisp-key-settings)
(add-hook 'cperl-mode-hook 'perl-key-settings)
(add-hook 'fortran-mode-hook 'fortran-key-settings)
(add-hook 'f90-mode-hook 'f90-key-settings)
(global-unset-key "\C-x\C-z")
(global-set-key "\C-x\C-b" 'electric-buffer-list)