ACE is an operating system for the C64 and C128 that provides a Unix-like command-shell environment.
The ace16*.sfx archives were created by Ismael Cordeiro (ismael@cam.org) from the original files which are now available at ftp://ftp.jbrain.com/pub/cbm/os/ace/. More files can be found on that site.
Mirror sites – General information – File types – Data transfer