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If you want to use Emacs and SLIME with Opusmodus, that is possible. Here are steps that work: If you haven't already done so, install Quicklisp. Evaluate (ql:quickload "quicklisp-slime-helper"). Follow its instructions and put (load (expand-file-name "~/quicklisp/slime-helper.el")) into your ~/.emacs file. Start Opusmodus, and evaluate (cl-user::start-swank). This should print something like ";; Swank started at port: 4005". Now, start your Emacs. Type M-x slime-connect and you'll be prompted for a host (use the default, which is 127.0.0.1) and then a port. The port needs to match the port (default 4005) that was printed out earlier. You are now connected to Opusmodus. You should be able to say stuff like (list-plot '(1 2 3)) from the SLIME repl and have it work. The function cl-user::start-swank basically does (load "home:quicklisp;setup") and then (ql:quickload :swank) and then (swank:create-server :port 4005 :dont-close t), so there's no magic going on there. If you run into trouble, let me know and I'll try to help out.

Opusmodus 1.2 can be used from within the Emacs editor as well (see the post at the link below for details). For me as a programmer having additionally access to the Emacs Lisp IDE SLIME is greatly preferable due to various advanced features provided by Slime when compared with the more easy-to-use native IDE of Opusmodus. For more information on SLIME see its website: https://common-lisp.net/project/slime Unfortunately, the SLIME link is seemingly broken in Opusmodus 1.3, which I just started for the first time. For those who have no SLIME installed (but have Quicklisp set up), SLIME can be installed with the following command. (ql:quickload "quicklisp-slime-helper") Unfortunately, this results now in an error. To load "quicklisp-slime-helper": Load 1 ASDF system: quicklisp-slime-helper ; Loading "quicklisp-slime-helper" .. > Error: Undefined function asdf/interface::operation-forced called with arguments (#<load-op>) . > While executing: #<standard-method asdf/action:perform (asdf/lisp-action:load-op swank-loader::swank-loader-file)>, in process Listener-2(9). > Type cmd-/ to continue, cmd-. to abort, cmd-\ for a list of available restarts. > If continued: Retry applying asdf/interface::operation-forced to (#<load-op>). > Type :? for other options. I already had SLIME installed, but simply running it does not work either and results in the same error. (cl-user::start-swank) ? To load "swank": Load 1 ASDF system: swank ; Loading "swank" . > Error: Undefined function asdf/interface::operation-forced called with arguments (#<load-op>) . > While executing: #<standard-method asdf/action:perform (asdf/lisp-action:load-op swank-loader::swank-loader-file)>, in process Listener-2(9). > Type cmd-/ to continue, cmd-. to abort, cmd-\ for a list of available restarts. > If continued: Retry applying asdf/interface::operation-forced to (#<load-op>). > Type :? for other options. Any help? Thanks a lot! Best, Torsten