I've attached a little utility I wrote last weekend to convert plain cartridge dumps (ROM or BIN) files into .CAR files.
It's an HTML file, just open it in your browser, then drag and drop the files you want converted.
I can't promise it will work on all browsers (it uses a lot of modern browser features), but tested on firefox and chrome.
Although Jac wrote a utility to do the same thing (Atari ROM Maker - and I've been using it a *lot* recently while working on my SD-multicart project), its a bit painful for ad-hoc use, so I wanted a more user-friendly way to allow things to be converted to CAR format for the cartridge. Maybe also useful for emulator users too though.
Only tested with a few cartridge types so far, so if you find any problems, let me know and I'll fix and update the copy here.
Edited by electrotrains, Thu Aug 13, 2015 1:34 PM.