FrotzDC 1.0 has a serious bug preventing you from saving correctly. The CD images have been removed and a binary with a temporary work-around is available in the downloads section. This new binary will not use the new file selector during load and save operations, instead it uses the original “Enter filename:” prompt and will only allow you to save on the VMU in port 1. New cd images will be created once the file selector has been properly fixed.